Timothy Keiper
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View article: Towards mitigating radiological health disparities using virtual strategies in global medical physics education: A RAD-AID International example
Towards mitigating radiological health disparities using virtual strategies in global medical physics education: A RAD-AID International example Open
The global distribution of radiological health services is extremely heterogeneous. In the past few years, it has been shown that approximately 90% of the population in the low-income world lacks access to radiotherapy and between one-half…
View article: Comparing brass mesh to tissue equivalent bolus materials for volumetric modulated arc therapy chest wall irradiation
Comparing brass mesh to tissue equivalent bolus materials for volumetric modulated arc therapy chest wall irradiation Open
Purpose To compare the superficial dose when using brass mesh bolus (BMB), no bolus, or 3 mm tissue‐equivalent bolus with a pseudo‐flash volumetric modulated arc therapy (VMAT) breast treatment planning technique. Methods Two different bea…
View article: Real‐time motion monitoring using orthogonal cine MRI during MR‐guided adaptive radiation therapy for abdominal tumors on 1.5T MR‐Linac
Real‐time motion monitoring using orthogonal cine MRI during MR‐guided adaptive radiation therapy for abdominal tumors on 1.5T MR‐Linac Open
Background Real‐time motion monitoring (RTMM) is necessary for accurate motion management of intrafraction motions during radiation therapy (RT). Purpose Building upon a previous study, this work develops and tests an improved RTMM techniq…
View article: Clinical commissioning of an adaptive radiotherapy platform: Results and recommendations
Clinical commissioning of an adaptive radiotherapy platform: Results and recommendations Open
Online adaptive radiotherapy platforms present a unique challenge for commissioning as guidance is lacking and specialized adaptive equipment, such as deformable phantoms, are rare. We designed a novel adaptive commissioning process consis…
View article: Clinical Implementation and Initial Experience of Real-Time Motion Tracking With Jaws and Multileaf Collimator During Helical Tomotherapy Delivery
Clinical Implementation and Initial Experience of Real-Time Motion Tracking With Jaws and Multileaf Collimator During Helical Tomotherapy Delivery Open
Practical workflows for the use of the first clinical motion tracking and correction system in helical tomotherapy delivery have been developed, and the system has now been successfully implemented in our clinic for treating patients with …
View article: Technical Note: Comprehensive performance tests of the first clinical real‐time motion tracking and compensation system using MLC and jaws
Technical Note: Comprehensive performance tests of the first clinical real‐time motion tracking and compensation system using MLC and jaws Open
Purpose To evaluate the performance of the first clinical real‐time motion tracking and compensation system using multileaf collimator (MLC) and jaws during helical tomotherapy delivery. Methods Appropriate mechanical and dosimetry tests w…
View article: Robust Manipulation of Magnetism in Dilute Magnetic Semiconductor (Ga,Mn)As by Organic Molecules
Robust Manipulation of Magnetism in Dilute Magnetic Semiconductor (Ga,Mn)As by Organic Molecules Open
In originally published article, the effects of the sulfur passivation and formation of MHA SAM on the surfaces of GaAs and (Ga,Mn)As were elucidated by X-ray photoelectron spectroscopy (XPS).Specifically, Figure 1 shows a schematic repres…
View article: Molecular Patterning and Directed Self-Assembly of Gold Nanoparticles on GaAs
Molecular Patterning and Directed Self-Assembly of Gold Nanoparticles on GaAs Open
The ability to create micro-/nanopatterns of organic self-assembled monolayers (SAMs) on semiconductor surfaces is crucial for fundamental studies and applications in a number of emerging fields in nanoscience. Here, we demonstrate the dir…
View article: Gold Nanoparticle Monolayers with Tunable Optical and Electrical Properties
Gold Nanoparticle Monolayers with Tunable Optical and Electrical Properties Open
Centimeter-scale gold nanoparticle (Au NP) monolayer films have been fabricated using a water/organic solvent self-assembly strategy. A recently developed approach, drain to deposit, is demonstrated to be most effective in transferring the…