Optimization of 3D imaging time reduction by assessing spatial resolution in the slice selective direction using the ladder method

IF 2.1 4区医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Magnetic resonance imaging Pub Date : 2024-10-01 DOI:10.1016/j.mri.2024.110246

Tomokazu Takeuchi , Norio Hayashi , Kouichi Ujita , Yusuke Sato , Ayako Taketomi-Takahashi , Takayuki Suto , Yoshito Tsushima

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引用次数: 0

Abstract

Purpose

Assessing spatial resolution in MRI is challenging due to non-linearity. Despite the widespread use of 3D imaging in clinical practice for lesion detection and multi-planar reconstruction (MPR), the extended acquisition time poses a shortcoming. To address this, the “Slice resolution” parameter is utilized; however, its impact on MPR images is unclear. This study aims to assess spatial resolution using the ladder method, investigate the effects of diverse slice resolution settings in various imaging sequences, and propose optimal conditions.

Methods

Images were acquired using various 3D imaging sequences—SPACE T1WI, SPACE T2WI, and VIBE T1WI—with different slice resolutions. Axial cross-section images were acquired and reconstructed into coronal cross-sections. The ladder method was employed for objective evaluation, including spatial frequency analysis. Additionally, visual evaluation was conducted and compared with ladder method results.

Results

For three imaging sequences, the evaluated value of ladder method remained relatively constant from 100 % to 80 % slice resolution. However, the evaluated value decreased in low-spatial frequency for slice resolution below 70 %.

Conclusions

Results from both ladder method and visual evaluations indicated image quality remained stable when the slice resolution was decreased to 80 %, potentially enabling a 20 % reduction in imaging time while preserving resolution in other cross-sections reconstructed by MPR.

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使用阶梯法评估切片选择方向的空间分辨率，优化缩短三维成像时间。

目的：由于非线性，评估磁共振成像的空间分辨率具有挑战性。尽管三维成像在病变检测和多平面重建（MPR）的临床实践中得到了广泛应用，但其采集时间长的缺点也随之而来。为了解决这个问题，我们使用了 "切片分辨率 "参数，但它对 MPR 图像的影响尚不清楚。本研究旨在利用阶梯法评估空间分辨率，研究各种成像序列中不同切片分辨率设置的影响，并提出最佳条件：方法：使用各种三维成像序列--SPACE T1WI、SPACE T2WI 和 VIBE T1WI--以不同的切片分辨率采集图像。采集轴向横截面图像并重建为冠状横截面图像。采用阶梯法进行客观评估，包括空间频率分析。此外，还进行了目视评估，并与阶梯法结果进行了比较：在三种成像序列中，梯形法的评估值在切片分辨率为 100 % 到 80 % 之间保持相对稳定。然而，当切片分辨率低于 70% 时，低空间频率的评估值有所下降：阶梯法和视觉评估的结果表明，当切片分辨率降低到 80% 时，图像质量保持稳定，有可能使成像时间缩短 20%，同时保持 MPR 重建的其他横截面的分辨率。

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

Magnetic resonance imaging 医学-核医学

CiteScore

4.70

自引率

4.00%

发文量

194

审稿时长

83 days

期刊介绍： Magnetic Resonance Imaging (MRI) is the first international multidisciplinary journal encompassing physical, life, and clinical science investigations as they relate to the development and use of magnetic resonance imaging. MRI is dedicated to both basic research, technological innovation and applications, providing a single forum for communication among radiologists, physicists, chemists, biochemists, biologists, engineers, internists, pathologists, physiologists, computer scientists, and mathematicians.