Survey of conventional and spiral CT doses

被引:32
作者
Hidajat, N
Wolf, M
Nunnemann, A
Liersch, P
Gebauer, B
Teichgräber, U
Schröder, RJ
Felix, R
机构
[1] Tech Univ Berlin, Virchow Clin, Charite, Dept Radiol Strahlenklin & Poliklin, D-13353 Berlin, Germany
[2] Tech Supervisory Author, Berlin, Germany
关键词
computed tomography (CT); radiation exposure; dosimetry; radiations; exposure to patients and personnel; measurement;
D O I
10.1148/radiology.218.2.r01ja12395
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 [临床医学]; 100207 [影像医学与核医学]; 1009 [特种医学];
摘要
PURPOSE: To investigate the radiation dose for conventional computed tomography (CT) and spiral CT during different CT examinations at various hospitals and practices. MATERIALS AND METHODS: CT dose index with an active length of 15 cm was measured in 16 different types of CT scanners by using ionization chamber dosimetry. Twenty-six holders tone who has legal responsibility under national law for a radiologic installation) operating a total of seven conventional and 20 spiral CT scanners were asked for their standard parameters for various CT examinations. Weighted CT dose index and dose-length product were determined for each examination. RESULTS: For most examinations, the tube current time product was significantly higher for conventional CT than for spiral CT (.002 less than or equal to P less than or equal to .05). The ratio of section distance to section thickness for conventional CT was significantly lower than the pitch for spiral CT(.001 less than or equal to P less than or equal to .05). The weighted CT dose index and dose-length product for spiral CT were about half of those for conventional CT. The third quartiles for weighted CT dose index and dose-length product for spiral CT were much lower than those recommended as reference doses. CONCLUSION: CT examinations with conventional CT scanners are often performed with unnecessarily high radiation dose. For the establishment of reference doses, the radiation dose with spiral CT scanners should be taken into account.
引用
收藏
页码:395 / 401
页数:7
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