摘要
PURPOSE: We aim to take advantage of the projection reconstruction with data sharing from adjacent echo images for acceleration of quantitative T2* measurements.
MATERIAL AND METHODS: In projection reconstruction imaging, MR data are acquired radially to fill the k-space with a densely sampled center region, implying the ability of reconstructing multiple T2 weighted images as well as a T2 map from a single image data set. We extended the similar concept conjugated with the dual echo radial meniscus imaging sequence to speed up the T2* measurements. The proposed imaging method was performed on 3T MRI with 8 different TEs=0.82/2/3/4/6.95/8.13/9.13/10.13 ms, flip angle = 600, TR = 700ms, number of slice = 8, slice thickness = 5mm, projection number = 512, readout per projection = 512, in-plane resolution = 0.24×0.24 mm2, acquisition time per repeat = 5 min 58 sec. After that, 2- and 4-fold undersampled radial k-space data was extracted from this integral data set to test the acceleration ability of the contrast manipulation in our radial meniscus imaging.
RESULTS: Significant improvement of image quality was achieved in the images reconstructed using the proposed method. Moreover, average T2* fittings from these three different projection data sets were derived, respectively. The
derived T2* values were increased from 5.7578 ms to 5.8464 (1.5% error) with two-fold acceleration, and 6.3284 ms (9.9% error) with four-fold acceleration, respectively.
CONCLUSION: Our preliminary finding demonstrated that the proposed method provides an alternative to obtain multiple T2* weighted images and a reliable T2* measurement with a shorter acquisition time, which may be helpful in the implementation of in vivo meniscus T2* mapping in clinical application.
MATERIAL AND METHODS: In projection reconstruction imaging, MR data are acquired radially to fill the k-space with a densely sampled center region, implying the ability of reconstructing multiple T2 weighted images as well as a T2 map from a single image data set. We extended the similar concept conjugated with the dual echo radial meniscus imaging sequence to speed up the T2* measurements. The proposed imaging method was performed on 3T MRI with 8 different TEs=0.82/2/3/4/6.95/8.13/9.13/10.13 ms, flip angle = 600, TR = 700ms, number of slice = 8, slice thickness = 5mm, projection number = 512, readout per projection = 512, in-plane resolution = 0.24×0.24 mm2, acquisition time per repeat = 5 min 58 sec. After that, 2- and 4-fold undersampled radial k-space data was extracted from this integral data set to test the acceleration ability of the contrast manipulation in our radial meniscus imaging.
RESULTS: Significant improvement of image quality was achieved in the images reconstructed using the proposed method. Moreover, average T2* fittings from these three different projection data sets were derived, respectively. The
derived T2* values were increased from 5.7578 ms to 5.8464 (1.5% error) with two-fold acceleration, and 6.3284 ms (9.9% error) with four-fold acceleration, respectively.
CONCLUSION: Our preliminary finding demonstrated that the proposed method provides an alternative to obtain multiple T2* weighted images and a reliable T2* measurement with a shorter acquisition time, which may be helpful in the implementation of in vivo meniscus T2* mapping in clinical application.
| 貢獻的翻譯標題 | 人體半月軟骨板 T2*量測之加速: 利用鄰近回訊的資料分享之投影重建 |
|---|---|
| 原文 | 英語 |
| 出版狀態 | 已發佈 - 3月 2014 |
| 事件 | The 63rd Annual Meeting of RSROC - Chung Shan Medical University, Taichung, 台灣 持續時間: 3月 22 2014 → 3月 23 2014 https://www.rsroc.org.tw/annual/annualnews_detail.asp?id=64 |
會議
| 會議 | The 63rd Annual Meeting of RSROC |
|---|---|
| 國家/地區 | 台灣 |
| 城市 | Taichung |
| 期間 | 3/22/14 → 3/23/14 |
| 網際網路位址 |