Comparison of low-energy virtual monoenergetic images between photon-counting CT and energy-integrating detectors CT: A phantom study

IF 4.9 2区医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Diagnostic and Interventional Imaging Pub Date : 2024-09-01 DOI:10.1016/j.diii.2024.02.009

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Abstract

Purpose

The purpose of this study was to assess image quality and dose level using a photon-counting CT (PCCT) scanner by comparison with a dual-source CT (DSCT) scanner on virtual monoenergetic images (VMIs) at low energy levels.

Materials and methods

A phantom was scanned using a DSCT and a PCCT with a volume CT dose index of 11 mGy, and additionally at 6 mGy and 1.8 mGy for PCCT. Noise power spectrum and task-based transfer function were evaluated from 40 to 70 keV on VMIs to assess noise magnitude and noise texture (f_av) and spatial resolution on two iodine inserts (f₅₀), respectively. A detectability index (d’) was computed to assess the detection of two contrast-enhanced lesions according to the energy level used.

Results

For all energy levels, noise magnitude values were lower with PCCT than with DSCT at 11 and 6 mGy, but greater at 1.8 mGy. f_av values were higher with PCCT than with DSCT at 11 mGy (8.6 ± 1.5 [standard deviation [SD]%), similar at 6 mGy (1.6 ± 1.5 [SD]%) and lower at 1.8 mGy (-17.8 ± 2.2 [SD]%). For both inserts, f₅₀ values were higher with PCCT than DSCT at 11- and 6 mGy for all keV levels, except at 6 mGy and 40 keV. d’ values were higher with PCCT than with DSCT at 11- and 6 mGy for all keV and both simulated lesions. Similar d' values to those of the DSCT at 11 mGy, were obtained at 2.25 mGy for iodine insert at 2 mg/mL and at 0.96 mGy for iodine insert at 4 mg/mL at 40 keV.

Conclusion

Compared to DSCT, PCCT reduces noise magnitude and improves noise texture, spatial resolution and detectability on VMIs for all low-keV levels.

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光子计数 CT 与能量积分探测器 CT 的低能虚拟单能图像比较：一项模型研究。

目的：本研究旨在通过比较双源 CT（DSCT）扫描仪与光子计数 CT（PCCT）扫描仪在低能量水平下的虚拟单能量图像（VMI），评估光子计数 CT（PCCT）扫描仪的图像质量和剂量水平：使用 DSCT 和 PCCT 扫描一个模型，体积 CT 剂量指数为 11 mGy，PCCT 为 6 mGy 和 1.8 mGy。在 VMI 上对 40 至 70 keV 的噪声功率谱和基于任务的传递函数进行了评估，以分别评估噪声大小和噪声纹理（fav）以及两个碘插入物（f50）的空间分辨率。根据所使用的能量水平计算可探测性指数（d'），以评估两个对比增强病灶的探测情况：在所有能量水平下，PCCT 的噪声幅度值在 11 和 6 mGy 时均低于 DSCT，但在 1.8 mGy 时高于 DSCT。在 11 mGy 时，PCCT 的赞成值高于 DSCT（8.6 ± 1.5 [标准差]%），在 6 mGy 时与 DSCT 相似（1.6 ± 1.5 [标准差]%），而在 1.8 mGy 时则低于 DSCT（-17.8 ± 2.2 [标准差]%）。对于两种插入物，除 6 mGy 和 40 keV 外，在 11 和 6 mGy 的所有 keV 水平下，PCCT 的 f50 值均高于 DSCT。在 11 mGy 时，与 DSCT 相似的 d'值在 2.25 mGy 时为 2 mg/mL，在 40 keV 时，与 DSCT 相似的 d'值在 0.96 mGy 时为 4 mg/mL：结论：与 DSCT 相比，PCCT 可降低噪声幅度，改善噪声纹理、空间分辨率和所有低 keV 水平 VMI 的可探测性。

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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.