当前位置： SCI文献检索 > MEDICAL PHYSICS期刊下所有文献 > SU-E-I-41: Characterization of a Linear Fiber-Optic Coupled Dosimeter.

SU-E-I-41: Characterization of a Linear Fiber-Optic Coupled Dosimeter.

Abstract：

PURPOSE:This study investigated the dosimetry performance of a linear fiber-optic coupled dosimeter with a sensitive element varying from 3 to 15 cm in length. The dosimeter is comprised of a tissue equivalent plastic scintillating fiber coupled to a photomultiplier tube (PMT). The sensitive element has a length representative of the dimensions of common adult internal organs and measures the absorbed dose along the entire sensitive length. The measurement of absorbed dose in one dimensional space provides a more meaningful measure of the average organ dose compared to current dosimeters which evaluate the dose at a small volume, or point inside the organ. METHOD AND MATERIALS:A fiber-optic coupled dosimetry system was modified by increasing the linear dimension of the sensitive element to sizes ranging from 3 to 15 cm. A FOC element providing a variable output as a function of exposed dosimeter length, beam energy, depth, and beam intensity, was characterized for various exposure parameters relating to Computed Tomography. A clinical x-ray tube, with half-value layer of 5.60 mm Al at 120 kVp, was used to evaluate the dosimeter response to beam energy, intensity, beam quality, and exposed length. RESULTS:The system consistently demonstrated linearity with tube output and length of the sensitive element and offering excellent sensitivity and reproducibility. The dosimeter also demonstrated a linear response of detected counts to length of scintillation material in the x-ray field over the range of interest. The sensitivity with respect to energy and depth showed a positive linear dependence. An 8% variation in sensitivity across a 12 cm depth was observed within a soft tissue-equivalent medium. CONCLUSION:The system allows for rapid and accurate average organ dose measurements relevant to x-ray sources within the diagnostic energy range. The response to previously discussed parameters was independent of the sensitive element length.

journal_name

Med Phys

journal_title

Medical physics

authors

Hoerner M,Hintenlang D

doi

10.1118/1.4734756

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

3634

issue

6Part4

eissn

0094-2405

issn

2473-4209

journal_volume

pub_type

杂志文章

在线工具

SU-E-I-41: Characterization of a Linear Fiber-Optic Coupled Dosimeter.