ls -la /home/daytona/workspace/ 2>/dev/null || echo "workspace empty or doesn't …

mkdir -p /home/daytona/workspace/xray-tube-pptx && echo "done"

~/xray-tube-pptx/build.js

const pptxgen = require("pptxgenjs");
const { execSync } = require("child_process");

// Fetch the X-ray tube diagram from textbook
const imgData = JSON.parse(execSync(
  `node /home/daytona/skills/shared/scripts/fetch_images.js "https://cdn.orris.care/cdss_images/a36c8f17d2dec7736684023857ea143a29e19678e8db5d5147f4592eb832cb82.png"`
).toString());
const tubeImg = imgData[0].base64;

let pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title = "X-Ray Tube: Components & Function";

// ─── Color palette ───────────────────────────────────────────────
const DARK  = "0D1B2A";   // deep navy (bg dominant)
const MID   = "1B3A5C";   // mid navy
const ACCENT= "00B4D8";   // sky blue accent
const GOLD  = "F4A261";   // warm gold
const WHITE = "FFFFFF";
const LGREY = "D0E8F2";   // light blue-grey text
const RED   = "E63946";   // highlight red

// ─── Helper: dark slide background ───────────────────────────────
function darkBg(slide) {
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:5.625, fill:{color:DARK} });
}

// ─── Helper: accent bar across top ───────────────────────────────
function accentBar(slide, label) {
  slide.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:0.55, fill:{color:ACCENT} });
  slide.addText(label, { x:0.3, y:0, w:9.4, h:0.55, fontSize:13, bold:true, color:DARK, valign:"middle", margin:0 });
}

// ─── Helper: section label pill ──────────────────────────────────
function pill(slide, txt, x, y, w) {
  slide.addShape(pres.ShapeType.roundRect, { x, y, w, h:0.32, fill:{color:ACCENT}, rectRadius:0.12 });
  slide.addText(txt, { x, y, w, h:0.32, fontSize:10, bold:true, color:DARK, align:"center", valign:"middle", margin:0 });
}

// ─── Helper: icon box ────────────────────────────────────────────
function iconBox(slide, icon, label, desc, x, y) {
  // box
  slide.addShape(pres.ShapeType.roundRect, { x, y, w:2.1, h:1.5, fill:{color:MID}, line:{color:ACCENT, width:1.2}, rectRadius:0.15 });
  // icon
  slide.addText(icon, { x, y:y+0.05, w:2.1, h:0.55, fontSize:22, align:"center", valign:"middle" });
  // label
  slide.addText(label, { x, y:y+0.58, w:2.1, h:0.3, fontSize:11, bold:true, color:ACCENT, align:"center", valign:"middle", margin:0 });
  // desc
  slide.addText(desc, { x:x+0.08, y:y+0.88, w:1.94, h:0.6, fontSize:8.5, color:LGREY, align:"center", valign:"top", wrap:true });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 1 — Title slide
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  // Background gradient strip
  s.addShape(pres.ShapeType.rect, { x:0, y:3.5, w:10, h:2.125, fill:{color:MID} });
  s.addShape(pres.ShapeType.rect, { x:0, y:3.5, w:10, h:0.05, fill:{color:ACCENT} });

  // Main title
  s.addText("X-RAY TUBE", {
    x:0.5, y:0.7, w:9, h:1.4, fontSize:64, bold:true, color:WHITE,
    align:"center", charSpacing:8
  });
  // Subtitle
  s.addText("Components & Function", {
    x:0.5, y:2.1, w:9, h:0.6, fontSize:26, color:ACCENT,
    align:"center", charSpacing:2
  });
  // Tag line
  s.addText("Exam Preparation Guide  |  Diagnostic Radiology", {
    x:0.5, y:3.7, w:9, h:0.45, fontSize:13, color:LGREY,
    align:"center", italic:true
  });
  // Source
  s.addText("Source: Gray's Anatomy for Students", {
    x:0.5, y:5.1, w:9, h:0.35, fontSize:9, color:"6699AA", align:"center"
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 2 — Historical context + overview
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 2  /  Historical Context & Overview");

  s.addText("From Roentgen to Modern Radiology", {
    x:0.4, y:0.65, w:9.2, h:0.5, fontSize:22, bold:true, color:WHITE
  });

  // Timeline strip
  const events = [
    { year:"1895", evt:"Roentgen discovers X-rays using cathode ray tube" },
    { year:"1913", evt:"Coolidge tube introduced — modern hot-cathode design" },
    { year:"1920s", evt:"Rotating anode developed to manage heat load" },
    { year:"Today", evt:"High-speed rotating anodes, digital detectors" },
  ];
  events.forEach((e, i) => {
    let x = 0.4 + i * 2.35;
    s.addShape(pres.ShapeType.rect, { x, y:1.25, w:2.1, h:0.38, fill:{color:ACCENT} });
    s.addText(e.year, { x, y:1.25, w:2.1, h:0.38, fontSize:13, bold:true, color:DARK, align:"center", valign:"middle" });
    s.addShape(pres.ShapeType.rect, { x:x+0.9, y:1.63, w:0.05, h:0.3, fill:{color:ACCENT} });
    s.addShape(pres.ShapeType.roundRect, { x, y:1.93, w:2.1, h:0.9, fill:{color:MID}, rectRadius:0.1 });
    s.addText(e.evt, { x:x+0.07, y:1.93, w:1.96, h:0.9, fontSize:8.5, color:LGREY, wrap:true, valign:"middle", align:"center" });
  });

  // Key concept box
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:3.05, w:9.2, h:2.3, fill:{color:MID}, line:{color:GOLD, width:1.5}, rectRadius:0.18 });
  s.addText("What is an X-Ray Tube?", { x:0.6, y:3.12, w:8.8, h:0.38, fontSize:14, bold:true, color:GOLD });
  const points = [
    "A vacuum-sealed glass envelope that converts electrical energy into X-radiation",
    "Contains two electrodes: the cathode (−) that emits electrons, and the anode (+) that receives them",
    "Only ~1% of kinetic electron energy converts to X-rays; the remaining 99% becomes heat",
    "Operates under high voltage (40–150 kV) to accelerate electrons across the tube",
  ];
  s.addText(points.map(p => ({ text: p, options: { bullet:{indent:15}, color:LGREY, breakLine:true } })),
    { x:0.6, y:3.52, w:8.8, h:1.75, fontSize:10.5, lineSpacingMultiple:1.3 }
  );
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 3 — Tube Diagram (textbook image)
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 3  /  X-Ray Tube Anatomy (Labeled Diagram)");

  // Textbook diagram
  s.addImage({ data: tubeImg, x:0.3, y:0.65, w:5.5, h:4.7 });

  // Labels panel
  s.addShape(pres.ShapeType.roundRect, { x:5.9, y:0.65, w:3.8, h:4.7, fill:{color:MID}, rectRadius:0.15 });
  s.addText("Key Components", { x:6.1, y:0.75, w:3.4, h:0.4, fontSize:14, bold:true, color:ACCENT });

  const comps = [
    { c:"Glass Envelope", d:"Vacuum-sealed; maintains low pressure for electron flow", col:WHITE },
    { c:"Cathode (−)", d:"Houses tungsten filament + focusing cup; source of electrons", col:ACCENT },
    { c:"Anode (+)", d:"Tungsten target on rotating disk; receives electrons, emits X-rays", col:GOLD },
    { c:"Focusing Cup", d:"Molybdenum cup that directs the electron beam onto the focal spot", col:WHITE },
    { c:"Tungsten Filament", d:"Heated wire; thermionic emission releases electrons", col:WHITE },
    { c:"Tungsten Target", d:"High Z, high melting point; X-rays produced here", col:WHITE },
  ];
  comps.forEach((c, i) => {
    let y = 1.22 + i * 0.67;
    s.addText(`• ${c.c}`, { x:6.1, y, w:3.4, h:0.28, fontSize:10.5, bold:true, color:c.col, margin:0 });
    s.addText(c.d, { x:6.2, y:y+0.26, w:3.3, h:0.36, fontSize:8.5, color:LGREY, wrap:true, margin:0 });
  });

  s.addText("Gray's Anatomy for Students, Fig. 1.2", {
    x:0.3, y:5.3, w:5.5, h:0.25, fontSize:8, color:"6699AA", italic:true, align:"center"
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 4 — Cathode in detail
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 4  /  The Cathode — Electron Source");

  s.addText("Cathode (Negative Electrode)", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:ACCENT
  });

  // Left column
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:1.18, w:4.5, h:4.1, fill:{color:MID}, rectRadius:0.15 });
  s.addText("Structure", { x:0.6, y:1.28, w:4.1, h:0.34, fontSize:13, bold:true, color:GOLD });
  const struct = [
    ["Tungsten Filament", "Coiled wire, ~2,000°C operating temperature"],
    ["Focusing Cup", "Molybdenum cup surrounds filament to shape electron beam"],
    ["Filament Size", "Small filament → small focal spot → better image sharpness"],
    ["Dual Filament", "Some tubes have large + small filament for different applications"],
  ];
  struct.forEach(([title, desc], i) => {
    s.addText(title, { x:0.6, y:1.68 + i*0.8, w:4.1, h:0.28, fontSize:10.5, bold:true, color:WHITE, margin:0 });
    s.addText(desc, { x:0.6, y:1.96 + i*0.8, w:4.1, h:0.46, fontSize:9, color:LGREY, wrap:true, margin:0 });
  });

  // Right column
  s.addShape(pres.ShapeType.roundRect, { x:5.1, y:1.18, w:4.5, h:4.1, fill:{color:MID}, rectRadius:0.15 });
  s.addText("Thermionic Emission", { x:5.3, y:1.28, w:4.1, h:0.34, fontSize:13, bold:true, color:GOLD });
  s.addText([
    { text: "When the filament is heated by passing an electric current through it, electrons gain enough energy to escape the metal surface — this is thermionic emission.\n\n", options:{color:LGREY} },
    { text: "Filament Current → Heat → Electron Cloud (Space Charge)\n\n", options:{color:WHITE, bold:true} },
    { text: "Key relationships:\n", options:{color:LGREY} },
    { text: "• mA (tube current) ", options:{color:ACCENT, bold:true} },
    { text: "controls the NUMBER of electrons → determines X-ray quantity (dose)\n", options:{color:LGREY} },
    { text: "• kV (tube voltage) ", options:{color:GOLD, bold:true} },
    { text: "controls the SPEED of electrons → determines X-ray energy (penetration/quality)\n\n", options:{color:LGREY} },
    { text: "Exam tip: ", options:{color:RED, bold:true} },
    { text: "mA × time = mAs = total exposure / dose", options:{color:WHITE} },
  ], { x:5.3, y:1.68, w:4.1, h:3.5, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 5 — Anode in detail
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 5  /  The Anode — X-Ray Production Site");

  s.addText("Anode (Positive Electrode)", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:GOLD
  });

  // Stationary vs Rotating
  const cols = [
    {
      title: "Stationary Anode",
      color: LGREY,
      items: [
        "Used in dental / low-power units",
        "Tungsten block embedded in copper",
        "Copper conducts heat away",
        "Limited heat dissipation → suitable for low output only",
        "Target angle: 15–20°",
      ]
    },
    {
      title: "Rotating Anode ★",
      color: ACCENT,
      items: [
        "Used in diagnostic radiology",
        "Tungsten-rhenium disk spins at 3,000–10,000 RPM",
        "Distributes heat over a large target area (annular track)",
        "Allows higher mA + shorter exposure times",
        "Anode heat capacity = major design limiting factor",
      ]
    }
  ];
  cols.forEach((col, ci) => {
    let x = 0.4 + ci*5.0;
    s.addShape(pres.ShapeType.roundRect, { x, y:1.18, w:4.6, h:2.3, fill:{color:MID}, line:{color:col.color, width:1.2}, rectRadius:0.15 });
    s.addText(col.title, { x:x+0.2, y:1.25, w:4.2, h:0.38, fontSize:13, bold:true, color:col.color });
    s.addText(col.items.map(t => ({ text:t, options:{bullet:{indent:12}, color:LGREY, breakLine:true} })),
      { x:x+0.2, y:1.63, w:4.2, h:1.8, fontSize:9, lineSpacingMultiple:1.3 });
  });

  // Tungsten properties box
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:3.65, w:9.2, h:1.7, fill:{color:MID}, line:{color:GOLD, width:1.2}, rectRadius:0.15 });
  s.addText("Why Tungsten (W) as Target Material?", { x:0.6, y:3.73, w:8.8, h:0.35, fontSize:13, bold:true, color:GOLD });
  const tungsten = [
    "High atomic number (Z = 74) → efficient X-ray production (Bremsstrahlung + characteristic radiation)",
    "Very high melting point (3,422°C) → withstands intense heat at focal spot",
    "High thermal conductivity → dissipates heat rapidly to the anode disc",
    "Rhenium (3–10%) added to improve ductility and resistance to surface cracking",
  ];
  s.addText(tungsten.map(t => ({ text:t, options:{bullet:{indent:12}, color:LGREY, breakLine:true} })),
    { x:0.6, y:4.1, w:8.8, h:1.2, fontSize:9.5, lineSpacingMultiple:1.3 });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 6 — X-Ray Production Mechanisms
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 6  /  Mechanisms of X-Ray Production");

  s.addText("Two Types of X-Radiation Produced", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  // Bremsstrahlung
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:1.2, w:4.5, h:4.15, fill:{color:MID}, line:{color:ACCENT, width:1.5}, rectRadius:0.15 });
  pill(s, "80–90% of X-Ray Output", 0.7, 1.22, 3.9);
  s.addText("Bremsstrahlung\n(Braking Radiation)", { x:0.6, y:1.58, w:4.1, h:0.6, fontSize:15, bold:true, color:ACCENT, align:"center" });
  s.addText([
    { text: "German: ", options:{color:LGREY} },
    { text: '"braking radiation"\n\n', options:{color:WHITE, italic:true} },
    { text: "Mechanism: ", options:{color:ACCENT, bold:true} },
    { text: "Electrons decelerate when they pass close to the positive tungsten nucleus. The kinetic energy lost is emitted as an X-ray photon.\n\n", options:{color:LGREY} },
    { text: "Key Features:\n", options:{color:WHITE, bold:true} },
    { text: "• Continuous spectrum of photon energies\n• Max photon energy = max kV applied\n• Majority of clinically useful X-rays\n• Occurs for all Z > 1 target materials", options:{color:LGREY} },
  ], { x:0.6, y:2.18, w:4.1, h:3.1, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });

  // Characteristic
  s.addShape(pres.ShapeType.roundRect, { x:5.1, y:1.2, w:4.5, h:4.15, fill:{color:MID}, line:{color:GOLD, width:1.5}, rectRadius:0.15 });
  pill(s, "10–20% of X-Ray Output", 5.4, 1.22, 3.9);
  s.addText("Characteristic\nRadiation", { x:5.3, y:1.58, w:4.1, h:0.6, fontSize:15, bold:true, color:GOLD, align:"center" });
  s.addText([
    { text: "Mechanism: ", options:{color:GOLD, bold:true} },
    { text: "Incoming electron ejects an inner-shell electron from tungsten. An outer-shell electron drops in to fill the vacancy, releasing a photon of characteristic energy.\n\n", options:{color:LGREY} },
    { text: "Key Features:\n", options:{color:WHITE, bold:true} },
    { text: "• Discrete (line) spectrum — fixed energies\n• Specific to target material (tungsten: K-shell ~59–69 keV)\n• Only produced above threshold kV (~70 kV for tungsten K-shell)\n• Adds useful peaks to the X-ray spectrum", options:{color:LGREY} },
  ], { x:5.3, y:2.18, w:4.1, h:3.1, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 7 — Vacuum Envelope & Tube Housing
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 7  /  Vacuum Envelope, Housing & Beam Collimation");

  s.addText("The Complete X-Ray Tube Assembly", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  const boxes = [
    {
      title:"Glass / Metal Envelope",
      icon:"💡",
      col:ACCENT,
      points:[
        "Evacuated to high vacuum (<10⁻⁶ mmHg)",
        "Prevents electron scattering by air molecules",
        "Borosilicate glass or metal-ceramic construction",
        "Insert windows allow X-ray beam exit",
      ]
    },
    {
      title:"Tube Housing",
      icon:"🔒",
      col:GOLD,
      points:[
        "Lead-lined metal casing surrounds glass envelope",
        "Absorbs leakage radiation (must be <1 mGy/hr at 1 m)",
        "Oil-filled for heat dissipation and electrical insulation",
        "Port (window) aligned with useful beam",
      ]
    },
    {
      title:"Beam Collimation",
      icon:"🎯",
      col:LGREY,
      points:[
        "Lead-lined shutters (collimators) narrow the beam",
        "Limit irradiated area to region of interest",
        "Reduce patient dose and image scatter",
        "Light beam localizer shows field before exposure",
      ]
    },
  ];

  boxes.forEach((b, i) => {
    let y = 1.2 + i * 1.43;
    s.addShape(pres.ShapeType.roundRect, { x:0.4, y, w:9.2, h:1.35, fill:{color:MID}, line:{color:b.col, width:1}, rectRadius:0.12 });
    s.addText(b.icon + "  " + b.title, { x:0.6, y:y+0.05, w:4, h:0.38, fontSize:12, bold:true, color:b.col });
    s.addText(b.points.map(p => ({ text:p, options:{bullet:{indent:12}, color:LGREY, breakLine:true} })),
      { x:0.6, y:y+0.43, w:8.8, h:0.88, fontSize:9, lineSpacingMultiple:1.2 });
  });

  // Heat note
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:5.18, w:9.2, h:0.32, fill:{color:RED}, rectRadius:0.1 });
  s.addText("⚠ Heat Capacity Alert: Only ~1% of energy → X-rays; 99% → heat. Anode cooling is the primary design constraint for high-powered tubes.", {
    x:0.5, y:5.18, w:9.0, h:0.32, fontSize:9, bold:true, color:WHITE, valign:"middle", align:"center"
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 8 — Exposure Parameters (kV, mA, mAs)
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 8  /  Exposure Parameters — kV, mA & mAs");

  s.addText("Controlling X-Ray Output", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  // Table header
  const tCols = [1.5, 3.0, 2.5, 2.0];
  const headers = ["Parameter", "Controls", "Effect on Image", "Effect on Dose"];
  let hx = 0.3;
  headers.forEach((h, i) => {
    s.addShape(pres.ShapeType.rect, { x:hx, y:1.18, w:tCols[i], h:0.38, fill:{color:ACCENT} });
    s.addText(h, { x:hx, y:1.18, w:tCols[i], h:0.38, fontSize:10, bold:true, color:DARK, align:"center", valign:"middle" });
    hx += tCols[i];
  });

  const rows = [
    ["kV (kilovoltage)", "Electron speed → X-ray energy (quality)", "↑ kV → more penetration, less contrast", "↑ kV → slightly ↑ dose"],
    ["mA (tube current)", "Number of electrons → X-ray quantity", "↑ mA → brighter image (more photons)", "↑ mA → ↑ dose proportionally"],
    ["mAs (= mA × s)", "Total exposure charge", "Determines overall image density/exposure", "↑ mAs → ↑ dose proportionally"],
    ["Exposure time (s)", "Duration of X-ray production", "↑ time → risk of motion blur", "↑ time → ↑ dose proportionally"],
  ];
  rows.forEach((row, ri) => {
    let rx = 0.3;
    let bg = ri % 2 === 0 ? MID : "142D4A";
    row.forEach((cell, ci) => {
      s.addShape(pres.ShapeType.rect, { x:rx, y:1.56+ri*0.55, w:tCols[ci], h:0.55, fill:{color:bg} });
      s.addText(cell, { x:rx+0.05, y:1.56+ri*0.55, w:tCols[ci]-0.1, h:0.55, fontSize:9, color:ci===0?GOLD:LGREY, wrap:true, valign:"middle" });
      rx += tCols[ci];
    });
  });

  // Heel effect note
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:3.88, w:9.2, h:1.5, fill:{color:MID}, line:{color:ACCENT, width:1}, rectRadius:0.12 });
  s.addText("Heel Effect", { x:0.6, y:3.96, w:8.8, h:0.34, fontSize:13, bold:true, color:ACCENT });
  s.addText([
    { text: "X-ray intensity is NOT uniform across the beam. The anode side of the beam is less intense than the cathode side because X-rays produced within the anode are partially absorbed by the anode material (self-filtration).\n\n", options:{color:LGREY} },
    { text: "Clinical use: ", options:{color:GOLD, bold:true} },
    { text: "Place the thicker/denser body part under the cathode end (higher intensity) for more uniform film density — e.g., femur imaging.", options:{color:LGREY} },
  ], { x:0.6, y:4.3, w:8.8, h:1.0, fontSize:9.5, lineSpacingMultiple:1.3, wrap:true });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 9 — Focal Spot & Geometric Factors
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 9  /  Focal Spot, Geometry & Image Quality");

  s.addText("Focal Spot & Geometric Unsharpness", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  // Left: focal spot box
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:1.18, w:4.5, h:4.15, fill:{color:MID}, rectRadius:0.15, line:{color:ACCENT, width:1} });
  s.addText("Focal Spot", { x:0.6, y:1.26, w:4.1, h:0.36, fontSize:14, bold:true, color:ACCENT });

  s.addText([
    { text: "Actual focal spot: ", options:{color:WHITE, bold:true} },
    { text: "Area on anode where electrons hit (real)\n\n", options:{color:LGREY} },
    { text: "Effective focal spot: ", options:{color:ACCENT, bold:true} },
    { text: "Projected area seen from the film/detector (apparent) — smaller due to anode angle\n\n", options:{color:LGREY} },
    { text: "Line Focus Principle:\n", options:{color:GOLD, bold:true} },
    { text: "Angling the anode face (10–20°) makes the effective focal spot much smaller than the actual focal spot → improved resolution without overloading one tiny area\n\n", options:{color:LGREY} },
    { text: "Focal spot sizes:\n", options:{color:WHITE, bold:true} },
    { text: "• Small (0.1–0.6 mm): magnification views, fine detail\n• Large (0.6–1.2 mm): routine work, tolerates higher mA\n", options:{color:LGREY} },
  ], { x:0.6, y:1.65, w:4.1, h:3.5, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });

  // Right: geometry factors
  s.addShape(pres.ShapeType.roundRect, { x:5.1, y:1.18, w:4.5, h:4.15, fill:{color:MID}, rectRadius:0.15, line:{color:GOLD, width:1} });
  s.addText("Geometric Factors", { x:5.3, y:1.26, w:4.1, h:0.36, fontSize:14, bold:true, color:GOLD });

  const gfactors = [
    ["Source-to-Image Distance (SID)", "↑ SID → less magnification, less unsharpness. Standard: 100 cm for chest PA"],
    ["Object-to-Image Distance (OID)", "↓ OID → less magnification, sharper image. Keep receptor close to patient"],
    ["Focal Spot Size", "Smaller focal spot → less geometric unsharpness → sharper image"],
    ["Penumbra / Unsharpness", "Geometric unsharpness ∝ focal spot size × OID / (SID − OID)"],
  ];
  gfactors.forEach(([title, desc], i) => {
    s.addText(title, { x:5.3, y:1.68+i*0.9, w:4.1, h:0.3, fontSize:10.5, bold:true, color:ACCENT, margin:0 });
    s.addText(desc, { x:5.3, y:1.98+i*0.9, w:4.1, h:0.55, fontSize:9, color:LGREY, wrap:true, margin:0 });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 10 — Radiation Quality & Filtration
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 10  /  Beam Quality, Filtration & HVL");

  s.addText("Beam Quality & Radiation Filtration", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  // Filtration section
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:1.18, w:9.2, h:2.05, fill:{color:MID}, rectRadius:0.15, line:{color:ACCENT, width:1} });
  s.addText("Beam Filtration", { x:0.6, y:1.26, w:8.8, h:0.34, fontSize:13, bold:true, color:ACCENT });

  const filts = [
    { t:"Inherent Filtration", d:"Glass wall of the tube + insulating oil + exit window. Equivalent ~0.5–1.0 mm Al. Removes the lowest-energy (soft) X-rays.", col:LGREY },
    { t:"Added Filtration", d:"Aluminium (Al) or copper (Cu) sheets placed in the beam path. Required by law: total ≥2.5 mm Al equivalent for >70 kV tubes.", col:LGREY },
    { t:"Total Filtration", d:"Inherent + Added. Removes low-energy photons that only irradiate skin without contributing to the diagnostic image.", col:WHITE },
  ];
  filts.forEach((f, i) => {
    let x = 0.6 + i * 3.0;
    s.addText(f.t, { x, y:1.63, w:2.8, h:0.28, fontSize:10, bold:true, color:GOLD, margin:0 });
    s.addText(f.d, { x, y:1.91, w:2.8, h:1.25, fontSize:8.5, color:f.col, wrap:true, margin:0 });
  });

  // HVL section
  s.addShape(pres.ShapeType.roundRect, { x:0.4, y:3.32, w:4.5, h:2.0, fill:{color:MID}, rectRadius:0.12, line:{color:GOLD, width:1} });
  s.addText("Half-Value Layer (HVL)", { x:0.6, y:3.4, w:4.1, h:0.34, fontSize:13, bold:true, color:GOLD });
  s.addText([
    { text: "The thickness of material needed to reduce beam intensity by 50%.\n\n", options:{color:LGREY} },
    { text: "↑ HVL = harder (more penetrating) beam\n", options:{color:WHITE} },
    { text: "↓ HVL = softer beam (more absorbed)\n\n", options:{color:WHITE} },
    { text: "Clinical: HVL is used to measure beam quality and ensure adequate filtration.", options:{color:LGREY} },
  ], { x:0.6, y:3.76, w:4.1, h:1.5, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });

  // X-ray spectrum
  s.addShape(pres.ShapeType.roundRect, { x:5.1, y:3.32, w:4.5, h:2.0, fill:{color:MID}, rectRadius:0.12, line:{color:ACCENT, width:1} });
  s.addText("X-Ray Spectrum Summary", { x:5.3, y:3.4, w:4.1, h:0.34, fontSize:13, bold:true, color:ACCENT });
  s.addText([
    { text: "• Continuous (Bremsstrahlung) + discrete peaks (characteristic)\n", options:{color:LGREY} },
    { text: "• Max photon energy (keV) = kVp numerically\n", options:{color:LGREY} },
    { text: "• Mean photon energy ≈ 1/3 kVp\n", options:{color:LGREY} },
    { text: "• Filtration shifts spectrum toward higher energies\n", options:{color:LGREY} },
    { text: "• ↑ kVp broadens & shifts spectrum rightward\n", options:{color:LGREY} },
  ], { x:5.3, y:3.76, w:4.1, h:1.5, fontSize:9.5, lineSpacingMultiple:1.35, wrap:true });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 11 — Clinical Applications & Modalities
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  accentBar(s, "SLIDE 11  /  Clinical Applications & Related Modalities");

  s.addText("X-Ray Tube in Clinical Practice", {
    x:0.4, y:0.65, w:9.2, h:0.45, fontSize:20, bold:true, color:WHITE
  });

  const mods = [
    { icon:"🦷", name:"Plain Radiography", kv:"40–120 kV", use:"Chest, bone, abdomen. Static image. Standard imaging workhorse.", col:ACCENT },
    { icon:"🔬", name:"Fluoroscopy", kv:"70–120 kV", use:"Real-time continuous X-ray. Barium studies, angiography, orthopaedic guidance.", col:GOLD },
    { icon:"🫀", name:"Cardiac Cath / Angio", kv:"60–90 kV", use:"High-speed rotating anode. Short exposures (3–6 ms) to freeze cardiac motion.", col:RED },
    { icon:"🧠", name:"CT Scanner", kv:"80–140 kV", use:"X-ray tube rotates around patient. Slip-ring technology. Continuous rotation.", col:WHITE },
    { icon:"🦷", name:"Mammography", kv:"25–35 kV", use:"Low kV, molybdenum/rhodium target for soft-tissue contrast (breast tissue).", col:LGREY },
    { icon:"🦴", name:"Fluoroscopy (Ortho)", kv:"70–120 kV", use:"Image intensifier tube converts X-rays → light → electrons → bright image.", col:ACCENT },
  ];

  mods.forEach((m, i) => {
    let col = i % 3;
    let row = Math.floor(i / 3);
    let x = 0.4 + col * 3.15;
    let y = 1.2 + row * 1.9;
    s.addShape(pres.ShapeType.roundRect, { x, y, w:3.0, h:1.8, fill:{color:MID}, line:{color:m.col, width:1}, rectRadius:0.14 });
    s.addText(m.icon + "  " + m.name, { x:x+0.12, y:y+0.08, w:2.8, h:0.36, fontSize:11, bold:true, color:m.col });
    s.addText("kV: " + m.kv, { x:x+0.12, y:y+0.44, w:2.8, h:0.26, fontSize:9, bold:true, color:GOLD });
    s.addText(m.use, { x:x+0.12, y:y+0.7, w:2.76, h:1.0, fontSize:8.5, color:LGREY, wrap:true });
  });
}

// ═══════════════════════════════════════════════════════════════
// SLIDE 12 — Exam Summary / Cheat Sheet
// ═══════════════════════════════════════════════════════════════
{
  let s = pres.addSlide();
  darkBg(s);
  s.addShape(pres.ShapeType.rect, { x:0, y:0, w:10, h:0.55, fill:{color:RED} });
  s.addText("EXAM CHEAT SHEET — X-Ray Tube", {
    x:0.3, y:0, w:9.4, h:0.55, fontSize:15, bold:true, color:WHITE, valign:"middle", charSpacing:2, margin:0
  });

  const cols = [
    {
      title:"Component → Function",
      color:ACCENT,
      items:[
        "Cathode = negative electrode; emits electrons via thermionic emission",
        "Tungsten filament = heated to 2000°C; releases electrons",
        "Focusing cup = shapes electron beam onto focal spot",
        "Anode = positive electrode; receives electrons; X-rays produced",
        "Rotating anode = distributes heat; allows high mA",
        "Tungsten target = high Z + high melting point",
        "Glass envelope = maintains vacuum for electron flow",
      ]
    },
    {
      title:"Key Equations & Facts",
      color:GOLD,
      items:[
        "mAs = mA × time → determines dose",
        "kVp → X-ray energy (penetration / quality)",
        "Max photon energy (keV) = kVp",
        "Mean photon energy ≈ kVp / 3",
        "1% electrical energy → X-rays; 99% → heat",
        "HVL: thickness reducing intensity by 50%",
        "Total filtration ≥ 2.5 mm Al equivalent (>70 kV)",
      ]
    },
    {
      title:"Common Exam Traps",
      color:RED,
      items:[
        "Bremsstrahlung = continuous spectrum (NOT discrete)",
        "Characteristic = discrete spectrum; needs threshold kV",
        "Heel effect: cathode side = more intense than anode",
        "↑ SID improves sharpness (less magnification)",
        "Small focal spot = better resolution but less heat tolerance",
        "Rotating anode spins at 3,000–10,000 RPM",
        "Line focus principle: angled anode → smaller effective focal spot",
      ]
    },
  ];

  cols.forEach((col, ci) => {
    let x = 0.3 + ci * 3.25;
    s.addShape(pres.ShapeType.roundRect, { x, y:0.62, w:3.15, h:4.95, fill:{color:MID}, rectRadius:0.13 });
    s.addShape(pres.ShapeType.rect, { x, y:0.62, w:3.15, h:0.36, fill:{color:col.color} });
    s.addText(col.title, { x:x+0.08, y:0.62, w:2.99, h:0.36, fontSize:9.5, bold:true, color:DARK, valign:"middle", margin:0 });
    s.addText(col.items.map(t => ({ text:t, options:{bullet:{indent:10}, color:LGREY, breakLine:true} })),
      { x:x+0.1, y:1.0, w:2.95, h:4.5, fontSize:8.5, lineSpacingMultiple:1.35 });
  });
}

// ─── Write file ──────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/xray-tube-pptx/XRay_Tube_Components_Function.pptx" })
  .then(() => console.log("DONE"))
  .catch(e => { console.error(e); process.exit(1); });

cd /home/daytona/workspace/xray-tube-pptx && node build.js 2>&1

ls -lh /home/daytona/workspace/xray-tube-pptx/XRay_Tube_Components_Function.pptx