An evaluation of computed tomography dose index measurements using a pencil ionisation chamber and small detectors

被引：13

作者：

Anam, Choirul ^{[1
]}

Fujibuchi, Toshioh ^{[2
]}

Haryanto, Freddy ^{[3
]}

Widita, Rena ^{[3
]}

Arif, Idam ^{[3
]}

Dougherty, Geoff ^{[4
]}

机构：

[1] Diponegoro Univ, Dept Phys, Fac Math & Nat Sci, Jl Prof Soedarto SH, Semarang 50275, Cent Java, Indonesia

[2] Kyushu Univ, Dept Hlth Sci, Fac Med Sci, Higashi Ku, 3-1-1 Maidashi, Fukuoka, Fukuoka 8128582, Japan

[3] Bandung Inst Technol, Fac Math & Nat Sci, Dept Phys, Ganesha 10, Bandung 40132, West Java, Indonesia

[4] Calif State Univ Channel Isl, Dept Appl Phys & Med Imaging, Camarillo, CA 93012 USA

来源：

JOURNAL OF RADIOLOGICAL PROTECTION | 2019年 / 39卷 / 01期

关键词：

CT dosimetry; computed tomography dose index; small detector; small ionisation chamber; pencil ionisation chamber; CT dose profiler; WATER-EQUIVALENT DIAMETER; CONE-BEAM CT; PROFILES;

D O I：

10.1088/1361-6498/aaf2b4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this study was to compare the values of the computed tomography dose index 100 (CTDI100) obtained using two small detectors (i.e. a small ionisation chamber and a small solid state detector) with those obtained from a 100 mm pencil ionisation chamber for various input CT parameters: beam width, kVp, mAs, pitch, and head-body phantom variation. The measurement of CTDI100 using the 100 mm pencil chamber was carried out in a single rotation of axial mode, while the measurement using small detectors was carried out in helical mode. The differences of CTDI100 values obtained with two small detectors were about 7% for all variations. The differences of CTDI100 values obtained with small detectors and a 100 mm pencil ionisation chamber for beam widths of more than 4 mm were within 40%. However, for the narrowest beam widths (4 mm), the difference between them was very large (about 150%).

引用

页码：112 / 124

页数：13

共 29 条

[1]

AAPM, 2010, 111 AAPM

[2]

American Association of Physicists in Medicine, 1993, 39 AAPM

[3] Profile of CT scan output dose in axial and helical modes using convolution [J].