Utility of under-sampled scans with iterative reconstruction and high-frequency preserving transform for high spatial resolution magnetic resonance cholangiopancreatography.

IF 2.1 4区医学

Japanese Journal of Radiology Pub Date : 2025-03-01 Epub Date: 2024-11-05 DOI:10.1007/s11604-024-01688-z

Shota Kondo, Yuko Nakamura, Toru Higaki, Takashi Nishihara, Masahiro Takizawa, Toru Shirai, Motoshi Fujimori, Yoshitaka Bito, Keigo Narita, Dara Fonseca, Shogo Maeda, Ikuo Kawashita, Yukiko Honda, Kazuo Awai

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引用次数: 0

Abstract

Purpose: Under-sampled scans with iterative reconstruction and high-frequency preserving transform (Us-IRHF) can increase the acquisition speed without degrading the image quality by recovering image information from under-sampled data. We investigate the clinical applicability of high spatial resolution magnetic resonance cholangiopancreatography (MRCP) images without extending the scanning time using Us-IRHF.

Methods: A slit phantom was scanned with conventional- (without Us-IRHF), Us-IR- (without HF), and Us-IRHF scanning. The matrix size was 320 × 320 for Us-IR- and Us-IRHF- and 288 × 208 for conventional scanning. Modulation transfer function (MTF) focused on the 1.0 lp/cm gauge for each scanning was calculated. For clinical study we acquired respiratory-triggered 3D MRCP scans with and without Us-IRHF (U⁺-, U^-MRCP) in 41 patients. The matrix size was 320 × 320 for U⁺- and 288 × 208 for U^-MRCP. The acquisition time and the relative duct-to-periductal contrast ratios (RCs) for the right- and left intrahepatic bile-, the common bile-, and the main pancreatic duct were recorded. Visualization of each duct and overall image quality was scored on 5-point confidence scales. For visualization of each duct the score ranged from 1 (not visible) to 5 (visible with excellent details), for the image quality, it ranged from 1 (undiagnostic) to 5 (excellent). Superiority for the qualitative visualization score and non-inferiority for the RC values with prespecified margins were assessed.

Results: Phantom study showed that compared to the conventional- and Us-IR (without HF) images, the MTF for the Us-IRHF image revealed the highest response. For clinical study, the mean acquisition time was 161 s for U⁺- and 165 s for U^-MRCP. For all ducts, the RC value of U⁺MRCP was non-inferior to U^-MRCP and the qualitative visualization score assigned to U⁺MRCP was superior to U^-MRCP.

Conclusion: Us-IRHF improved the image quality of high spatial resolution MRCP without extending the scanning time.

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采用迭代重建和高频保留变换的欠采样扫描在高空间分辨率磁共振胰胆管造影中的应用。

目的：采用迭代重建和高频保留变换（Us-IRHF）的欠采样扫描可通过从欠采样数据中恢复图像信息，在不降低图像质量的情况下提高采集速度。我们研究了使用 Us-IRHF 在不延长扫描时间的情况下获得高空间分辨率磁共振胰胆管造影（MRCP）图像的临床适用性：方法：对一个狭缝模型进行传统扫描（不含Us-IRHF）、Us-IR扫描（不含高频）和Us-IRHF扫描。Us-IR-和 Us-IRHF-扫描的矩阵大小为 320 × 320，常规扫描的矩阵大小为 288 × 208。每次扫描的调制传递函数（MTF）都集中在 1.0 lp/cm 刻度上进行计算。在临床研究中，我们对 41 名患者进行了呼吸触发三维 MRCP 扫描，包括使用和不使用 U-IRHF（U+-，U-MRCP）。U+- 的矩阵大小为 320 × 320，U-MRCP 的矩阵大小为 288 × 208。记录了采集时间以及左右肝内胆管、胆总管和主胰管的相对导管与导管对比度（RC）。每个导管的可视化和整体图像质量按 5 分置信度评分。每条导管的可视度从 1 分（不可见）到 5 分（可见且细节极佳）不等，图像质量从 1 分（无法诊断）到 5 分（极佳）不等。评估了定性可视化评分的优劣，以及预设边缘的 RC 值的非劣性：模型研究显示，与传统红外图像和Us-IR（无高频）图像相比，Us-IRHF图像的MTF响应最高。在临床研究中，U+- 和 U-MRCP 的平均采集时间分别为 161 秒和 165 秒。对于所有导管，U+MRCP 的 RC 值均不劣于 U-MRCP，而 U+MRCP 的定性可视化评分优于 U-MRCP：结论：Us-IRHF 提高了高空间分辨率 MRCP 的图像质量，但并未延长扫描时间。

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

Japanese Journal of Radiology Medicine-Radiology, Nuclear Medicine and Imaging

自引率

4.80%

发文量

133

期刊介绍： Japanese Journal of Radiology is a peer-reviewed journal, officially published by the Japan Radiological Society. The main purpose of the journal is to provide a forum for the publication of papers documenting recent advances and new developments in the field of radiology in medicine and biology. The scope of Japanese Journal of Radiology encompasses but is not restricted to diagnostic radiology, interventional radiology, radiation oncology, nuclear medicine, radiation physics, and radiation biology. Additionally, the journal covers technical and industrial innovations. The journal welcomes original articles, technical notes, review articles, pictorial essays and letters to the editor. The journal also provides announcements from the boards and the committees of the society. Membership in the Japan Radiological Society is not a prerequisite for submission. Contributions are welcomed from all parts of the world.