The purpose of this study is to validate Eclipse's electron Monte Carlo algorithm (eMC) in heterogeneous phantoms using radiochromic films and EGSnrc as a reference Monte Carlo algorithm. Four heterogeneous phantoms are used in this study. Radiochromic films are inserted in these phantoms, including in heterogeneous media, and the measured relative dose distributions are compared to eMC calcula...

In order to take an axial transverse tomogram having few obstructive shadows, the phantom and human experiment were perfomed and studied. Thorax cage phantom composed of ribs made of lead wire was laid on the table of axial transverse tomograph of horizontal type and the axial transverse tomograms were taken with the central X-ray of caudalocranial or craniacaudal direction with the range of ro...

background: since tumors located in thorax region of body mainly move due to respiration, in the modern radiotherapy, there have been many attempts such as; external markers, strain gage and spirometer represent for monitoring patients’ breathing signal. with the advent of fluoroscopy technique, indirect methods were proposed as an alternative approach to extract patients’ breathing signals. ma...

Accurate and efficient simulation of an x-ray transform for representative structures plays an important role in research and development of x-ray CT, for the evaluation and improvement of CT image reconstruction algorithms, in particular. Superquadrics are a family of three-dimensional objects, which can be used to model a variety of anatomical structures. In this paper, we propose an algorith...

Spectral computed tomography (CT) exploits measurements from x-rays with different energies to obtain the 3D description of the patient in a material basis. It requires to solve two subproblems, namely the material decomposition and the tomographic reconstruction problems, either sequentially or jointly. In this work, we address the material decomposition problem, which an ill-posed non-linear ...

Purpose Deformable registration is now routinely used at many radiation oncology centers not only for automatic contouring, but also for diagnostic image registration and dose accumulation. In these applications, it is essential that these registrations are not only characterized with phantom studies, but also be checked on a per-patient basis around the regions where the deformable registratio...