Comparison of image quality and radiation dose between split-filter dual-energy images and single-energy images in single-source abdominal CT

被引：50

作者：

Euler, Andre ^{[1
,4
]}

Obmann, Markus M. ^{[1
]}

Szucs-Farkas, Zsolt ^{[2
]}

Mileto, Achille ^{[3
]}

Zaehringer, Caroline ^{[1
]}

Falkowski, Anna L. ^{[1
]}

Winkel, David J. ^{[1
]}

Marin, Daniele ^{[4
]}

Stieltjes, Bram ^{[1
]}

Krauss, Bernhard ^{[5
]}

Schindera, Sebastian T. ^{[1
]}

机构：

[1] Univ Basel, Univ Hosp Basel, Clin Radiol & Nucl Med, Petersgraben 4, CH-4031 Basel, Switzerland

[2] Hosp Ctr Biel, Inst Radiol, Biel, Switzerland

[3] Univ Washington, Sch Med, Dept Radiol, Seattle, WA 98195 USA

[4] Duke Univ, Med Ctr, Dept Radiol, Durham, NC 27710 USA

[5] Siemens Med Solut, Erlangen, Germany

来源：

EUROPEAN RADIOLOGY | 2018年 / 28卷 / 08期

关键词：

Single-source dual-energy CT; Split-filter dual-energy CT; Automatic tube voltage selection; Spectral shaping; Virtual monoenergetic imaging; TUBE VOLTAGE SELECTION; HYPERVASCULAR LIVER-TUMORS; COMPUTED-TOMOGRAPHY; CURRENT MODULATION; SPECTRAL-SEPARATION; IN-VITRO; PHANTOM; NOISE; CONSPICUOUSNESS; RECONSTRUCTION;

D O I：

10.1007/s00330-018-5338-x

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

To compare image quality and radiation dose of abdominal split-filter dual-energy CT (SF-DECT) combined with monoenergetic imaging to single-energy CT (SECT) with automatic tube voltage selection (ATVS). Two-hundred single-source abdominal CT scans were performed as SECT with ATVS (n = 100) and SF-DECT (n = 100). SF-DECT scans were reconstructed and subdivided into composed images (SF-CI) and monoenergetic images at 55 keV (SF-MI). Objective and subjective image quality were compared among single-energy images (SEI), SF-CI and SF-MI. CNR and FOM were separately calculated for the liver (e.g. CNRliv) and the portal vein (CNRpv). Radiation dose was compared using size-specific dose estimate (SSDE). Results of the three groups were compared using non-parametric tests. Image noise of SF-CI was 18% lower compared to SEI and 48% lower compared to SF-MI (p < 0.001). Composed images yielded higher CNRliv over single-energy images (23.4 vs. 20.9; p < 0.001), whereas CNRpv was significantly lower (3.5 vs. 5.2; p < 0.001). Monoenergetic images overcame this inferiority in CNRpv and achieved similar results compared to single-energy images (5.1 vs. 5.2; p > 0.628). Subjective sharpness was equal between single-energy and monoenergetic images and diagnostic confidence was equal between single-energy and composed images. FOMliv was highest for SF-CI. FOMpv was equal for SEI and SF-MI (p = 0.78). SSDE was significant lower for SF-DECT compared to SECT (p < 0.022). The combined use of split-filter dual-energy CT images provides comparable objective and subjective image quality at lower radiation dose compared to single-energy CT with ATVS. Split-filter dual-energy results in 18% lower noise compared to single-energy with ATVS. Split-filter dual-energy results in 11% lower SSDE compared to single-energy with ATVS. Spectral shaping of split-filter dual-energy leads to an increased dose-efficiency.

引用

页码：3405 / 3412

页数：8

共 25 条

[21] Hypervascular liver tumors: Low tube voltage, high tube current multi-detector row CT for enhanced detection - Phantom study [J].