当前位置： SCI文献检索 > JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY期刊下所有文献 > Radiation dose reduction with chest computed tomography using adaptive statistical iterative reconstruction technique: initial experience.

Radiation dose reduction with chest computed tomography using adaptive statistical iterative reconstruction technique: initial experience.

Abstract：

PURPOSE:To assess radiation dose reduction and image quality for weight-based chest computed tomographic (CT) examination results reconstructed using adaptive statistical iterative reconstruction (ASIR) technique. MATERIALS AND METHODS:With local ethical committee approval, weight-adjusted chest CT examinations were performed using ASIR in 98 patients and filtered backprojection (FBP) in 54 weight-matched patients on a 64-slice multidetector CT. Patients were categorized into 3 groups: 60 kg or less (n = 32), 61 to 90 kg (n = 77), and 91 kg or more (n = 43) for weight-based adjustment of noise indices for automatic exposure control (Auto mA; GE Healthcare, Waukesha, Wis). Remaining scan parameters were held constant at 0.984:1 pitch, 120 kilovolts (peak), 40-mm table feed per rotation, and 2.5-mm section thickness. Patients' weight, scanning parameters, and CT dose index volume were recorded. Effective doses (EDs) were estimated. Image noise was measured in the descending thoracic aorta at the level of the carina. Data were analyzed using analysis of variance. RESULTS:Compared with FBP, ASIR was associated with an overall mean (SD) decrease of 27.6% in ED (ASIR, 8.8 [2.3] mSv; FBP, 12.2 [2.1] mSv; P < 0.0001). With the use of ASIR, the ED values were 6.5 (1.8) mSv (28.8% decrease), 7.3 (1.6) mSv (27.3% decrease), and 12.8 (2.3) mSv (26.8% decrease) for the weight groups of 60 kg or less, 61 to 90 kg, and 91 kg or more, respectively, compared with 9.2 (2.3) mSv, 10.0 (2.0) mSv, and 17.4 (2.1) mSv with FBP (P < 0.0001). Despite dose reduction, there was less noise with ASIR (12.6 [2.9] mSv) than with FBP (16.6 [6.2] mSv; P < 0.0001). CONCLUSIONS:Adaptive statistical iterative reconstruction helps reduce chest CT radiation dose and improve image quality compared with the conventionally used FBP image reconstruction.

journal_name

J Comput Assist Tomogr

journal_title

Journal of computer assisted tomography

authors

Prakash P,Kalra MK,Digumarthy SR,Hsieh J,Pien H,Singh S,Gilman MD,Shepard JA

doi

10.1097/RCT.0b013e3181b26c67

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

40-5

issue

eissn

0363-8715

issn

1532-3145

pii

00004728-201001000-00008

journal_volume

pub_type

杂志文章

在线工具

Radiation dose reduction with chest computed tomography using adaptive statistical iterative reconstruction technique: initial experience.