Gwofan

SUSTCer, Duke Medical physics Master, SJTU PhD student
Share own opinions

[Gwofan @gwofan]

Bye NINGBO

[Gwofan @gwofan]

Just finished a 1-month research internship at Eastern Institute of Technology, Ningbo (EIT).

Thanks to advisors Prof. Jesse Zhu and Dr. Donovan Chaffart.

New Yongjiang campus — built for bold science.

https://t.co/S1jkW8xwUc
https://t.co/YLFAED74xm

[Gwofan @gwofan]

Adaptation is not optional.

Weekly fixed plans: 10/29 lost coverage; 5 had CTV D98% <50 Gy. Margin cuts without weekly MR risk a migrating GTV.

Mann IJROBP 2026;125:1541–1550; doi:10.1016/j.ijrobp.2026.02.217
Parent: Detsky Lancet Oncol 2026;27:729737; NCT04726397

[Gwofan @gwofan]

Small margins need eyes on a moving tumor.

UNITED GBM (Mann et al.): 1.5T MR-Linac, 5 mm CTV + weekly adaptation vs 1.5–3 cm conventional CTV.

Normal-brain V60Gy ~146–157→~84–93 cm; brainstem Dmax 56.1→49.0 Gy; chiasm 41.5→38.4 Gy.

[Gwofan @gwofan]

Everyone remembers that just a few hours before the GPT-6 Astra release, the networks of all the top AI labs crashed.

Back then, everyone thought it was just an ordinary network glitch.

[Gwofan @gwofan]

REF:
Ashmeg S, Aldosary G, El-Amin YY, et al. Can Radiation Therapy Services Survive in Conflict-Affected Regions? Int J Radiat Oncol Biol Phys. 2026;125(5):1304-1316.
https://t.co/xsHuHukBVZ
Video: https://t.co/qGNOFFrtBv

[Gwofan @gwofan]

Radiation therapy is a machine plus people. War can take both.

Ashmeg et al. in the Red Journal ask if RT can survive in conflict regions. Voices from Sudan, Yemen, Syria, Palestine, and Ukraine. Medical physicists are still showing up.

[Gwofan @gwofan]

We are one community of shared destiny. 人类命运共同体.

Thank you to colleagues who keep linacs, plans, and QA running when the city is not safe. Cancer care there is not extra. It is patient safety.

Welcome to discuss.

[Gwofan @gwofan]

REF:
CMDE. 创新医疗器械特别审查申请审查结果公示（2026年第14号）. Aug 25, 2026.
ProtonCN recap: https://t.co/H7H9U0dPxQ
Hangzhou Daily, Mar 31, 2026: https://t.co/5rc2rLjCxZ
ChiCTR: https://t.co/wuuYLHBcuO

[Gwofan @gwofan]

China put another AB-BNCT system on the NMPA innovation track.

CMDE notice No. 14 of 2026 (Aug 25) lists Huabor Neutron (Hangzhou) boron neutron capture therapy system. Public comment to Sep 8. This is a green channel, not a market approval.

[Gwofan @gwofan]

Same company: injectable boron-10 falen (CXHL2600055) got a trial permit in March 2026. Phase I is a drug-device study with HyBorSys in Huzhou, for recurrent or locally advanced head and neck.

Neuboron is already in Phase II. China is stacking BNCT vendors.

Welcome to discuss.

[Gwofan @gwofan]

REF:
UW Health, July 28, 2026: https://t.co/14D05A3tcM
Leo Cancer Care, Sept 29, 2025: https://t.co/d9Wifntp4w
Froedtert & MCW, Mar 27, 2026: https://t.co/5vvx6MPVKO

[Gwofan @gwofan]

Wisconsin just opened a second proton center. UW Health started treating at Eastpark in Madison on July 28, 2026. Adult patients only, clinical trial first.

Hitachi gantry is live. Leo Marie upright is installed. Sitting treatment is not open yet.

[Gwofan @gwofan]

Froedtert & MCW in Milwaukee treated first in the state in March 2026 on a Mevion S250i. Same year, two vendors. Gantry now. Upright later.

Welcome to discuss.

[Gwofan @gwofan]

REF:
PSI. The spot-scanning technique. https://t.co/fdVzivjHy4
Pedroni E, Bacher R, Blattmann H, et al. The 200-MeV proton therapy project at PSI. Med Phys. 1995;22(1):37-53. https://t.co/rs9IKdkG9S

[Gwofan @gwofan]

Spot scanning is a thin proton pencil. One Bragg peak is one spot. Superimpose thousands of spots and the dose follows the tumor in 3D.

PSI developed this and treated the first routine patients. About 10,000 spots for 1 litre. PBS is painting, not a scattering field.

[Gwofan @gwofan]

The three figures are from PSI. One spot. Then a stack. Then a conformal volume. Same physics as every PBS room now.

Welcome to discuss.

[Gwofan @gwofan]

REF:
Kang M, Pang D. Commissioning and beam characterization of the first gantry-mounted accelerator pencil beam scanning proton system. Med Phys. 2020;47(8):3496-3510.
https://t.co/LWGIp2EPMY

[Gwofan @gwofan]

The first gantry-mounted PBS proton system is Mevion HYPERSCAN. The synchrocyclotron sits on the gantry. No long beamline.

Kang and Pang commissioned it in Medical Physics 2020. Spot size in air: 4 mm at 227 MeV, 26 mm at 28 MeV. Adaptive Aperture cuts penumbra 2-13 mm.

[Gwofan @gwofan]

What is different from conventional PBS: Energy Selector is binary, so effective SSD moves toward isocenter at low energy. Bragg peak 80%-80% width stays 8.4 mm at all energies. AA interleaf leakage <1.5% at the highest energy.

Welcome to discuss.