18 research outputs found
Modeling photon output caused by backscattered radiation into the monitor chamber from collimator jaws using a Monte Carlo technique
Optimizing the Delivery of Radiation Therapy to Cancer Patients
In the field of radiation therapy, much of the research is aimed at developing new innovative techniques for treating cancer patients with radiation. In recent years, new treatment machines have been developed that provide a much greater degree of computer control than was available with machines of previous generations. One innovation nave been the development of an approach called "tomotherapy". Tomotherapy can be defined as computer-controlled rotational radiotherapy delivered using an intensity-modulated fan beam of radiation.
The successful implementation of the new delivery techniques requires the development of a suitable approach for optimizing each patient's treatment plan. One of the challenges is to quantify optimality in radiation therapy/ We have tested a variety of objective functions and constraints in pursuit of a formulation that performs well for a wide variety of disease sites. An additional challenge stems from sizable amount of data and the large number of variables that are involved in each optimization. This paper presents several approaches to optimizing treatment plans in radiation therapy, and the advantages and disadvantages of a number of formulations are explored
Confirmation, refinement, and extension of a study in intrafraction motion interplay with sliding jaw motion
On the cause of the variation in tissue-maximum ratio values with source-to-detector distance
Technical note: A novel boundary condition using contact elements for finite element based deformable image registration
Bragg peak prediction from quantitative proton computed tomography using different path estimates
On the use of a proton path probability map for proton computed tomography reconstruction1
Purpose: To describe a method to estimate the proton path in proton computed tomography (pCT) reconstruction, which is based on the probability of a proton passing through each point within an object to be imaged