The density measurements in pCT imaging

Ivan Evseev; Joaquim Teixeira de Assis; Olga Yevseyeva; Hugo Reuters Schelin; Margio Cezar Loss Klock; Joao Antonio Palma Setti; Ricardo Tadeu Lopes; Ubirajara Maribondo Vinagre Filho; Reinhard W. Schulte; David C. Williams

doi:10.1117/12.595720

20 April 2005 The density measurements in pCT imaging

Ivan Evseev, Joaquim Teixeira de Assis, Olga Yevseyeva, Hugo Reuters Schelin, Margio Cezar Loss Klock, Joao Antonio Palma Setti, Ricardo Tadeu Lopes, Ubirajara Maribondo Vinagre Filho, Reinhard W. Schulte, David C. Williams

Author Affiliations +

Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005) https://doi.org/10.1117/12.595720
Event: Medical Imaging, 2005, San Diego, California, United States

Abstract

In existing proton treatment centers, dose calculations are performed based on x-ray computerized tomography (CT). Alternatively, the therapeutic proton beam could be used to collect the data for treatment planning via proton CT (pCT). With the development of medical proton gantries, first at Loma Linda University Medical Center and now in several other proton treatment centers, it is of interest to continue the early pCT investigations of the 1970s and the early 1980s. From that time, the basic idea of the pCT method has advanced from average energy loss measurements to an individual proton tracking technique. This reduces the image degradation due to multiple Coulomb scattering. Thereby, the central pCT problem shifts to the fidelity of the physical information obtained about the scanned patient, which will be used for proton treatment planning. The accuracy of relative electron density distributions extracted from pCT images was investigated in this work using continuous slowing down approximation (CSDA) and water-equivalent-thickness (WET) concepts. Analytical results were checked against Monte Carlo simulations, which were obtained with SRIM2003 and GEANT4 Monte Carlo software packages. The range of applications and the sources of absolute errors are discussed.

Citation Download Citation

Ivan Evseev, Joaquim Teixeira de Assis, Olga Yevseyeva, Hugo Reuters Schelin, Margio Cezar Loss Klock, Joao Antonio Palma Setti, Ricardo Tadeu Lopes, Ubirajara Maribondo Vinagre Filho, Reinhard W. Schulte, and David C. Williams "The density measurements in pCT imaging", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); https://doi.org/10.1117/12.595720

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available