Abdominal image quality and dose reduction with energy-integrating or photon-counting detectors dual-source CT: A phantom study

IF 4.9 2区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Diagnostic and Interventional Imaging Pub Date : 2024-05-16 DOI:10.1016/j.diii.2024.05.002

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引用次数: 0

Abstract

Purpose

The purpose of this study was to assess image-quality and dose reduction potential using a photon-counting computed tomography (PCCT) system by comparison with two different dual-source CT (DSCT) systems using two phantoms.

Materials and methods

Acquisitions on phantoms were performed using two DSCT systems (DSCT1 [Somatom Force] and DSCT2 [Somatom Pro.Pulse]) and one PCCT system (Naeotom Alpha) at four dose levels (13/6/3.4/1.8 mGy). Noise power spectrum (NPS) and task-based transfer function (TTF) were computed to assess noise magnitude and noise texture and spatial resolution (f₅₀), respectively. Detectability indexes (d’) were computed to model the detection of abdominal lesions: one unenhanced high-contrast task, one contrast-enhanced high-contrast task and one unenhanced low-contrast task. Image quality was subjectively assessed on an anthropomorphic phantom by two radiologists.

Results

For all dose levels, noise magnitude values were lower with PCCT than with DSCTs. For all CT systems, similar noise texture values were found at 13 and 6 mGy, but the greatest noise texture values were found for DSCT2 and the lowest for PCCT at 3.4 and 1.8 mGy. For high-contrast inserts, similar or lower f₅₀ values were found with PCCT than with DSCT1 and the opposite pattern was found for the low-contrast insert. For the three simulated lesions, d’ values were greater with PCCT than with DSCTs. Abdominal images were rated satisfactory for clinical use by the radiologists for all dose levels with PCCT and for 13 and 6 mGy with DSCTs.

Conclusion

By comparison with DSCTs, PCCT reduces image-noise and improves detectability of simulated abdominal lesions without altering the spatial resolution and image texture. Image-quality obtained with PCCT seem to indicate greater potential for dose optimization than those obtained with DSCTs.

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使用能量积分或光子计数探测器双源 CT 的腹部图像质量和剂量降低：一项模型研究。

目的：本研究的目的是使用两个模型，通过与两种不同的双源 CT（DSCT）系统进行比较，评估光子计数计算机断层扫描（PCCT）系统的图像质量和降低剂量的潜力：使用两个 DSCT 系统（DSCT1 [Somatom Force] 和 DSCT2 [Somatom Pro.Pulse]）和一个 PCCT 系统（Naeotom Alpha）在四个剂量水平（13/6/3.4/1.8 mGy）下对模型进行采集。计算噪声功率谱（NPS）和基于任务的传递函数（TTF）以分别评估噪声大小、噪声纹理和空间分辨率（f50）。计算可探测性指数（d'）以模拟腹部病变的检测：一项未增强的高对比度任务、一项对比度增强的高对比度任务和一项未增强的低对比度任务。图像质量由两名放射科医生在一个拟人模型上进行主观评估：在所有剂量水平下，PCCT 的噪声幅度值均低于 DSCT。所有 CT 系统在 13 和 6 mGy 时的噪声纹理值相似，但 DSCT2 的噪声纹理值最大，而 PCCT 在 3.4 和 1.8 mGy 时的噪声纹理值最小。对于高对比度插入物，PCCT 发现的 f50 值与 DSCT1 相似或更低，而对于低对比度插入物则发现了相反的模式。对于三种模拟病变，PCCT 的 d'值高于 DSCT。放射科医生对所有剂量水平的 PCCT 腹部图像以及 13 和 6 mGy 的 DSCT 腹部图像的临床使用评价均为满意：结论：与 DSCT 相比，PCCT 在不改变空间分辨率和图像纹理的情况下，降低了图像噪声，提高了模拟腹部病变的可探测性。与 DSCT 相比，PCCT 获得的图像质量似乎更有可能优化剂量。

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

Diagnostic and Interventional Imaging Medicine-Radiology, Nuclear Medicine and Imaging

CiteScore

8.50

自引率

29.10%

发文量

126

审稿时长

11 days

期刊介绍： Diagnostic and Interventional Imaging accepts publications originating from any part of the world based only on their scientific merit. The Journal focuses on illustrated articles with great iconographic topics and aims at aiding sharpening clinical decision-making skills as well as following high research topics. All articles are published in English. Diagnostic and Interventional Imaging publishes editorials, technical notes, letters, original and review articles on abdominal, breast, cancer, cardiac, emergency, forensic medicine, head and neck, musculoskeletal, gastrointestinal, genitourinary, interventional, obstetric, pediatric, thoracic and vascular imaging, neuroradiology, nuclear medicine, as well as contrast material, computer developments, health policies and practice, and medical physics relevant to imaging.