Background

To investigate the feasibility of compressed sensing and parallel imaging (CS-PI)-accelerated bowel motility magnetic resonance imaging (MRI) and to compare its image quality and diagnostic quality to conventional sensitivity encoding (SENSE) accelerated scans.

Methods

Bowel MRI was performed in six volunteers using a three-dimensional balanced fast field-echo sequence. Static scans were performed after the administration of a spasmolytic agent to prevent bowel motion artefacts. Fully sampled reference scans and multiple prospectively 3× to 7× undersampled CS-PI and SENSE scans were acquired. Additionally, fully sampled CS-PI and SENSE scans were retrospectively undersampled and reconstructed. Dynamic scans were performed using 5× to 7× accelerated scans in the presence of bowel motion. Retrospectively, undersampled scans were compared to fully sampled scans using structural similarity indices. All reconstructions were visually assessed for image quality and diagnostic quality by two radiologists.

Results

For static imaging, the performance of CS-PI was lower than that of fully sampled and SENSE scans: the diagnostic quality was assessed as adequate or good for 100% of fully sampled scans, 95% of SENSE, but only for 55% of CS-PI scans. For dynamic imaging, CS-PI image quality was scored similar to SENSE at high acceleration. Diagnostic quality of all scans was scored as adequate or good; 55% of CS-PI and 83% of SENSE scans were scored as good.

Conclusion

Compared to SENSE, current implementation of CS-PI performed less or equally good in terms of image quality and diagnostic quality. CS-PI did not show advantages over SENSE for three-dimensional bowel motility imaging.

中文翻译：

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压缩感知MRI对加速肠蠕动成像的评估。

背景

调查压缩传感和并行成像（CS-PI）加速肠蠕动磁共振成像（MRI）的可行性，并将其图像质量和诊断质量与常规灵敏度编码（SENSE）加速扫描进行比较。

方法

六名志愿者使用三维平衡快速场回波序列进行了肠核磁共振成像。在施用解痉剂以防止排便伪像后进行静态扫描。获得了完全采样的参考扫描以及预期的3倍至7倍的欠采样CS-PI和SENSE扫描。此外，对完全采样的CS-PI和SENSE扫描进行回顾性欠采样和重建。在肠蠕动的情况下，使用5倍至7倍加速扫描进行动态扫描。回顾性地，使用结构相似性指数将欠采样扫描与完全采样扫描进行比较。由两名放射科医生目视评估所有重建物的图像质量和诊断质量。

结果

对于静态成像，CS-PI的性能低于完全采样和SENSE扫描的性能：对于100％的完全采样扫描，95％的SENSE，但仅对于55％的CS，诊断质量被评估为足够或良好-PI扫描。对于动态成像，CS-PI图像质量在高加速度下的得分与SENSE相似。所有扫描的诊断质量均被评定为适当或良好；55％的CS-PI和83％的SENSE扫描被评为良好。

结论

与SENSE相比，CS-PI的当前实施在图像质量和诊断质量方面表现差强人意。对于三维肠蠕动成像，CS-PI没有显示出超过SENSE的优势。