Chest computed tomography using iterative reconstruction vs filtered back projection (Part 2): image quality of low-dose CT examinations in 80 patients
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : François Pontana & Alain Duhamel & Julien Pagniez & Thomas Flohr & Jean-Baptiste Faivre & Anne-Lise Hachulla & Jacques Remy & Martine Remy-Jardin
- چاپ و سال / کشور: 2010
Description
Purpose To evaluate the image quality of an iterative reconstruction algorithm (IRIS) in low-dose chest CT in comparison with standard-dose filtered back projection (FBP) CT. Materials and methods Eighty consecutive patients referred for a follow-up chest CT examination of the chest, underwent a low-dose CT examination (Group 2) in similar technical conditions to those of the initial examination, (Group 1) except for the milliamperage selection and the replacement of regular FBP reconstruction by iterative reconstructions using three (Group 2a) and five iterations (Group 2b). Results Despite a mean decrease of 35.5% in the doselength- product, there was no statistically significant difference between Group 2a and Group 1 in the objective noise, signal-to-noise (SNR) and contrast-to-noise (CNR) ratios and distribution of the overall image quality scores. Compared to Group 1, objective image noise in Group 2b was significantly reduced with increased SNR and CNR and a trend towards improved image quality. Conclusion Iterative reconstructions using three iterations provide similar image quality compared with the conventionally used FBP reconstruction at 35% less dose, thus enabling dose reduction without loss of diagnostic information. According to our preliminary results, even higher dose reductions than 35% may be feasible by using more than three iterations.
Eur Radiol (2011) 21:636–643 DOI 10.1007/s00330-010-1991-4 Received: 1 July 2010 / Revised: 13 September 2010 / Accepted: 8 October 2010 / Published online: 16 November 2010
