Passive Income for a Hectic Radiology Resident

1. Leverage Your Radiology Knowledge Directly

• Record case-based teaching videos once and upload to YouTube or sell on platforms like Udemy, Teachable, or Osmosis. Radiology education is in high demand among medical students and junior residents.
• Write radiology question banks or flashcard decks (Anki) and sell them on platforms like Gumroad or Etsy. A well-structured chest X-ray or CT interpretation guide can sell passively for years.

• Not directly paid, but builds your profile and can lead to consulting/editing work.

• Companies like Scale AI, Aidoc, and Nanox pay radiologists to annotate imaging datasets. You do it on your own schedule - 1-2 hours on a quiet night or weekend.

2. Financial Investments (Set-and-Forget)

• The single highest-ROI passive income option for residents. Even investing $300-500/month into low-cost index funds (Vanguard, Fidelity) during residency compounds dramatically by the time you're an attending.
• Use a Roth IRA first (max $7,000/year in 2026) - your tax bracket as a resident is lower than it will ever be again. This is a uniquely favorable window.

• Park your emergency fund in a HYSA (currently ~4-5% APY). Completely passive.

• If you want real estate exposure without being a landlord, REITs traded on stock exchanges give you dividend income with zero management burden.

3. Real Estate (Low Involvement Options)

• Platforms like Fundrise, RealtyMogul, or CrowdStreet let you invest in real estate projects with as little as $500-1,000. Returns are typically 6-12% annually in dividends/appreciation, and you do nothing after investing.
• Physician-focused platforms like Passive Income MD have curated real estate syndication deals specifically for doctors.

• If you're buying a home near your program, renting out a room or basement covers a significant portion of your mortgage.

4. Digital Products & Writing

• Write a case report or review article once. Journals don't pay well, but if you publish in open-access journals, you build a reputation that leads to paid consulting/editorial work later.

• Niche radiology blogs (e.g., focused on MSK, neuro, or interventional) attract a dedicated audience. Monetize with ads, affiliate links to textbooks, or a paid Substack tier. Initial setup is time-heavy, but ongoing is ~1-2 hours/week.

• ABR Core Exam prep materials are perennially needed. If you create a high-quality study guide, question set, or spreadsheet system, sell it on Gumroad or Teachers Pay Teachers.

5. Peer-to-Peer / Automated Income

• Betterment or Wealthfront auto-invest and rebalance your portfolio. No active management needed.

• Build gradually during residency. Healthcare and utility stocks tend to pay reliable dividends.

Honest Prioritization for a Busy Resident

1. Max out your Roth IRA every year - the tax-free compounding from your resident years is irreplaceable.
2. Build one digital knowledge product (Anki deck, study guide, short course) that aligns with your radiology exam prep - you're studying anyway, so the marginal effort is low.

Blood vs Iron on MRI / SWAN: The Full Framework

Part 1 - The Core Physics (Why Both Bloom)

Part 2 - The Handedness Rule (Scanner-Dependent Phase Signal)

• Find the sagittal sinus or cortical veins on the phase image - they contain deoxyhemoglobin (paramagnetic). Whatever signal these are = the expected signal for blood/iron.
• Find the pineal gland, choroid plexus, or dorsum sellae (known physiologic calcification) - they will be the opposite signal.
• On GE SWAN specifically: veins are dark on phase, calcification is bright on phase.

• Blood / iron / hemosiderin = dark on SWAN magnitude + dark on phase
• Calcification = dark on SWAN magnitude + bright on phase

Part 3 - Differentiating Blood FROM Iron (Both Paramagnetic)

Part 4 - Your Specific Clinical Scenario: SWAN Blooming at Old Infarct + Acute at Same Region

• Encephalomalacia / gliosis
• Hemosiderin deposits (if there was any prior hemorrhagic transformation, even microhemorrhagic)

1. This is just the old hemosiderin from the prior infarct
2. There is new hemorrhagic transformation of the new infarct
3. Both

SWAN blooming at old infarct site, new presentation:

1. Is DWI restricted in the SAME zone?
   YES → Active acute ischemia confirmed
   
2. Is there NEW T1 bright signal (not old)?
   YES → Subacute/acute hemorrhagic transformation (methemoglobin)
   
3. Does FLAIR show NEW hyperintensity beyond the old cavity?
   YES → Acute edema = new event
   
4. Does CT show hyperdensity?
   YES → Acute hemorrhage
   NO → Likely hemosiderin from old event
   
5. Compare with prior MRI if available
   Old blooming same size/location = hemosiderin, not new

Part 5 - Blood Product Evolution Timeline on MRI (Quick Reference)

• Old hemosiderin is in the chronic stage - it has the most pronounced blooming because hemosiderin is highly paramagnetic.
• Acute deoxyhemoglobin also blooms but is accompanied by T2 darkening and DWI restriction (if ischemic).

Summary Table: Blood vs Iron vs Calcium on SWAN (GE system)