6 papers
Circulating Lymphocytes Preservation in Lung Cancer Stereotactic Body Radiation Therapy with Ultra-Fast Proton Delivery Using Modularized Pin Ridge Filters
Duncan Bohannon, Ahmal Jawad Zafar, Sibo Tian +9
Purpose: Radiation-induced lymphopenia is an increasingly recognized toxicity in lung radiotherapy and has been linked to radiation exposure to circulating lymphocytes (CL). In int…
Optimizing Transmission FLASH Radiotherapy for Large-Field Post-Mastectomy Breast Treatment
Ahmal Jawad Zafar, Sunil William Dutta, Matthew Joseph Case +5
We investigated the effects of scanning speed, beam configuration, and dose-rate modeling on the FLASH effect in post-mastectomy proton transmission-beam (TB) planning and evaluate…
Ultrafast Proton Delivery with Pin Ridge Filters (pRFs): A Novel Approach for Motion Management in Proton Therapy
Ahmal Jawad Zafar, Xiaofeng Yang, Yinan Wang +2
Active breath-hold techniques effectively mitigate respiratory motion but pose challenges for patients who are ineligible for the procedure. Conventional treatment planning relies…
An Adaptive Proton FLASH Therapy Using Modularized Pin Ridge Filter
Ahmal Jawad Zafar, Xiaofeng Yang, Zachary Diamond +4
In this paper, we proposed a method to optimize adaptive proton FLASH therapy (ADP FLASH) using modularized pin ridge filters (pRFs) by recycling module pins from the initial plan…
Ultrafast strong-field absorption in gapped graphene
S. Azar Oliaei Motlagh, Ahmal Jawad Zafar, Aranyo Mitra +2
We study theoretically the strong-field absorption of an ultrafast optical pulse by a gapped graphene monolayer. At low field amplitudes, the absorbance in the pristine graphene is…
Ultrafast optical currents in gapped graphene
S. Azar Oliaei Motlagh, Fatemeh Nematollahi, Aranyo Mitra +3
We study theoretically the interaction of ultrashort optical pulses with gapped graphene. Such strong pulse results in finite conduction band population and corresponding electric…