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

IF 4.7 2区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING European Radiology Pub Date : 2018-08-01 Epub Date: 2018-02-19 DOI:10.1007/s00330-018-5338-x

André Euler, Markus M Obmann, Zsolt Szucs-Farkas, Achille Mileto, Caroline Zaehringer, Anna L Falkowski, David J Winkel, Daniele Marin, Bram Stieltjes, Bernhard Krauss, Sebastian T Schindera

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引用次数: 44

Abstract

Objectives: 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).

Methods: 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. CNR_liv) and the portal vein (CNR_pv). Radiation dose was compared using size-specific dose estimate (SSDE). Results of the three groups were compared using non-parametric tests.

Results: 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 CNR_liv over single-energy images (23.4 vs. 20.9; p < 0.001), whereas CNR_pv was significantly lower (3.5 vs. 5.2; p < 0.001). Monoenergetic images overcame this inferiority in CNR_pv 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. FOM_liv was highest for SF-CI. FOM_pv was equal for SEI and SF-MI (p = 0.78). SSDE was significant lower for SF-DECT compared to SECT (p < 0.022).

Conclusions: 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.

Key points: • 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.

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单源腹部CT分滤双能图像与单能图像的图像质量和辐射剂量比较。

目的:比较单能扫描腹部分路滤波双能CT (SF-DECT)与自动选管电压单能CT (SECT)的成像质量和辐射剂量。方法:对200例单源腹部CT进行断层扫描，分别采用ATVS(100例)和SF-DECT(100例)。重建SF-DECT扫描并细分为合成图像(SF-CI)和55 keV单能图像(SF-MI)。比较单能量图像(SEI)、SF-CI和SF-MI的客观和主观图像质量。分别计算肝脏(如CNRliv)和门静脉(CNRpv)的CNR和FOM。采用尺寸特异性剂量估计(SSDE)比较辐射剂量。采用非参数检验对三组结果进行比较。结果:SF-CI的图像噪声比SEI低18%，比SF-MI低48% (p < 0.001)。合成图像的CNRliv高于单能量图像(23.4 vs 20.9;p < 0.001)，而CNRpv显著较低(3.5 vs. 5.2;P < 0.001)。单能量图像克服了CNRpv的这一劣势，与单能量图像相比获得了相似的结果(5.1 vs. 5.2;P > 0.628)。主观清晰度在单能量和单能量图像之间相等，诊断置信度在单能量和组合图像之间相等。SF-CI的foliv最高。SEI和SF-MI的FOMpv相等(p = 0.78)。SF-DECT的SSDE显著低于SECT (p < 0.022)。结论:与ATVS单能CT相比，分滤双能CT联合使用在较低辐射剂量下可提供相当的客观和主观图像质量。•与单能量的ATVS相比，分路滤波双能量的噪音降低了18%。•与ATVS的单能量相比，分体式过滤器双能量可将SSDE降低11%。•分光滤波器双能量的光谱整形导致增加的剂量效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Radiology 医学-核医学

CiteScore

11.60

自引率

8.50%

发文量

874

审稿时长

2-4 weeks

期刊介绍： European Radiology (ER) continuously updates scientific knowledge in radiology by publication of strong original articles and state-of-the-art reviews written by leading radiologists. A well balanced combination of review articles, original papers, short communications from European radiological congresses and information on society matters makes ER an indispensable source for current information in this field. This is the Journal of the European Society of Radiology, and the official journal of a number of societies. From 2004-2008 supplements to European Radiology were published under its companion, European Radiology Supplements, ISSN 1613-3749.