Scott explains why Midjourney's new ultrasound tomography scanner, despite being technologically interesting, faces major medical limitations and is unlikely to replace existing imaging methods or enable useful whole-body screening without significant future AI improvements. Longer summary

Scott analyzes Midjourney's announcement of a new medical scanner that uses ultrasound tomography to create 3D images of the body. He explains why, despite being technologically interesting, the scanner faces significant medical limitations: ultrasound cannot penetrate bone or air, limiting its usefulness compared to existing MRI and CT scans; it can't replace portable bedside ultrasound due to requiring patients to be submerged in water; and whole-body screening scans (even with existing superior MRI technology) are currently not recommended by medical consensus due to false positives causing more harm than benefit. Scott suggests the technology might become more viable if future AI advances dramatically improve ultrasound interpretation, wave dynamics for imaging through bone, and the ability to distinguish dangerous findings from harmless abnormalities. The post includes an appendix with Twitter responses from radiologists (universally negative) and other commenters (more optimistic), discussing potential applications like body composition measurement and the challenges of medical screening. Shorter summary

Scott Alexander proposes a hypothetical low-cost psychiatric practice to combat medical cost disease, exploring its potential and the barriers to its implementation. Longer summary

Scott Alexander explores the idea of creating a low-cost psychiatric practice called 'Cheap-O Psychiatry' to combat cost disease in medicine. He outlines a model that would significantly reduce overhead costs through telemedicine, self-booking, and direct payment, potentially offering appointments for as low as $35. The post discusses why such practices aren't more common, speculating on factors like the shortage of doctor-entrepreneurs, the dominance of insurance in the mid-range market, and the exhausting nature of rapid patient turnover. Scott suggests that such a venture might need to be done as a political protest to demonstrate the potential for cost reduction in healthcare. Shorter summary