An innovative instrumentation system for measuring the computed tomography dose index

Author

Magalhães, Cinthia M S ; Sobrinho, Marilia L. ; Souza, Divanizia N. ; Filho, João A. ; Santos, Luiz A P

Author_Institution

Depto. de Fis., Univ. Fed. de Sergipe (UFS), Aracaju, Brazil

fYear

2009

fDate

Oct. 24 2009-Nov. 1 2009

Firstpage

1246

Lastpage

1248

Abstract

This paper presents results from a semiconductor-based detector system to be used as an alternative for measuring the computed tomography dose index (CTDI) which is the dose descriptor in CT dosimetry. The 100 mm long ionization chamber is the device normally used, however some works have already indicated that small devices could replace the long ion chamber to improve the quality assurance procedures in CT dosimetry. This work shows how one can calculate the CTDI with a SMD phototransistor and its angular response for tomography beams.

Keywords

computerised tomography; dosimeters; ionisation chambers; semiconductor counters; SMD phototransistor; angular response; computed tomography dose index; dose descriptor; instrumentation system; ionization chamber; semiconductor-based detector system; tomography beams; Computed tomography; Detectors; Dosimetry; Instruments; Ionization chambers; Length measurement; Nuclear measurements; Phototransistors; Semiconductor devices; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record (NSS/MIC), 2009 IEEE

Conference_Location

Orlando, FL

ISSN

1095-7863

Print_ISBN

978-1-4244-3961-4

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2009.5402381

Filename

5402381