A clinical comparison of rigid and inflatable endorectal-coil probes for MRI and 3D MR spectroscopic imaging (MRSI) of the prostate
A clinical comparison of rigid and inflatable endorectal-coil probes for MRI and 3D MR spectroscopic imaging (MRSI) of the prostate
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DOI：
10.1002/jmri.21331
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发表时间：
2008-05-01
影响因子：
4.4
通讯作者：
Kurhanewicz, John
中科院分区：
文献类型：
--
作者：
Noworolski, Susan M.;Crane, Jason C.;Kurhanewicz, John
目的：比较4种直肠内线圈探头在前列腺磁共振成像中的数据质量和易用性。材料和方法：比较4种直肠内线圈探头：1)充气探头；2)全氟碳(PFC)充气探头；3)刚性较小原型线圈；4)用于前列腺活检的硬质较小线圈。检测图像的信噪比(SNR)、定位、垫片、MRI运动伪影和磁共振波谱成像(MRSI)频谱质量。结果：硬性线圈提供的信噪比是充气线圈的2.5倍。活检探头的敏感度在尖端显著降低。与充气探头相比，硬质探头放置时间更长(10+/-2比72分钟，P<；0.0002)，位置过于靠前，需要重新定位的次数更多(73%比20%，P<；0.003)，运动伪影更高(P<；0.001)。PFC充气探头的垫片时间最短(2+/-0.5分钟，P<；0.05)。充气探头产生的线宽较大(P<；0.01)，填补时间较长(7+/-4分钟)，频谱质量较差。结论：充气线圈使用方便，覆盖率好，运动伪影少，是一种良好的临床选择。建议使用PFC-通货膨胀率，因为它提供的数据比空气通货膨胀更高质量。坚硬、较小的探头具有较高的SNR，产生的组织变形较小，可能是某些应用的首选。
Purpose: To compare the data quality and ease of use of four endorectal-coil probe setups for prostate MRI.Materials and Methods: Four endorectal-coil probe setups were compared: 1) air-inflated probe; 2) perfluorocarbon (PFC)-inflated probe; 3) rigid, smaller prototype coil; and 4) rigid, smaller coil designed for biopsying the prostate. Signal-to-noise ratio (SNR), positioning, shimming, MRI motion artifact, and MR spectroscopic imaging (MRSI) spectral quality were assessed.Results: Rigid coils provided approximately 2.5-fold higher SNR than inflatable coils near the peripheral zone midline. The biopsy probe sensitivity decreased dramatically by the apex. The rigid probes, as compared to the inflatable probes, took longer to place (10 +/- 2 vs. 7 2 minutes, P < 0.0002), tended to be placed too superiorly, required repositioning more often (73% vs. 20%, P < 0.003), and had higher motion artifacts (P < 0.001). Shimming time was least for the PFC-inflated probe (2 +/- 0.5 minutes, P < 0.05). The air-inflated probe produced larger linewidths (P < 0.01) and tended to have longer shim times (7 +/- 4 minutes) and poorer spectral quality.Conclusion: The inflatable coil is a good clinical choice due to ease of use, good coverage, and low motion artifacts. PFC-inflation is recommended as it provided higher quality data than air-inflation. The rigid, smaller probes have higher SNR and produce less tissue distortion and may be preferred for certain applications.