Distortion correction in diffusion-weighted imaging of the breast: Performance assessment of prospective, retrospective, and combined (prospective + retrospective) approaches.
Distortion correction in diffusion-weighted imaging of the breast: Performance assessment of prospective, retrospective, and combined (prospective + retrospective) approaches.
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DOI：
10.1002/mrm.26328
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发表时间：
2017-07
影响因子：
3.3
通讯作者：
Tan ET
中科院分区：
文献类型：
--
作者：
Hancu I;Lee SK;Hulsey K;Lenkinski R;Holland D;Sperl JI;Tan ET
比较双侧乳腺弥散加权成像（DWI）扫描中前瞻性、回顾性和组合（前瞻性+回顾性）EPI失真校正方法的有效性。5名健康女性受试者接受了轴向双侧乳腺DWI检查，使用逐层线性匀场进行了前瞻性B 0不均匀性校正和未进行前瞻性B 0不均匀性校正。在每种情况下，在相位编码梯度极性反转的情况下进行额外的B=0 DWI扫描，以生成估计的B 0图;该图或单独采集的B 0图用于回顾性校正，单独或与前瞻性校正结合使用。评估了具有相似对比度的未失真解剖参考扫描与具有不同校正方案的校正后的B=0 DWI图像之间的对齐情况。当结合前瞻性和回顾性失真校正时，DWI图像和解剖参考扫描之间的平均交叉相关系数从0.82增加到0.92。此外，这样的校正基本上减少了图像对准的患者间变化和正常腺体组织中的平均表观扩散系数的可变性。结合前瞻性和回顾性失真校正可以提供一种有效的方法，以减少可测量性引起的图像失真，并提高乳腺DWI检查的可靠性。
To compare the effectiveness of prospective, retrospective and combined (prospective+retrospective) EPI distortion correction methods in bilateral breast diffusion weighted imaging (DWI) scans Five healthy female subjects underwent an axial bilateral breast DWI exam with and without prospective B0 inhomogeneity correction using slice-by-slice linear shimming. In each case an additional b=0 DWI scan was performed with the polarity of the phase encoding gradient reversed, to generate an estimated B0 map; this map or a separately acquired B0 map was used for retrospective correction, either alone or in combination with the prospective correction. The alignment between an undistorted, anatomical reference scan with similar contrast and the corrected b=0 DWI images with different correction schemes was assessed. The average cross correlation coefficient between the DWI images and the anatomical reference scan was increased from 0.82 to 0.92 over the five volunteers when combined prospective and retrospective distortion correction was applied. Furthermore, such correction substantially reduced patient-to-patient variation of the image alignment and the variability of the average apparent diffusion coefficient in normal glandular tissue. Combined prospective and retrospective distortion correction can provide an efficient way to reduce susceptibility-induced image distortions and enhance the reliability of breast DWI exams.