Multisection T1-weighted hybrid-rare: A pulse sequence for MR imaging of the entire liver during suspended respiration
✍ Scribed by Hernán Jara; Jorge A. Soto; Beverly Yu; Peter C. Hentzen; Gert H. van Yperen; E. Kent Yucel
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 983 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
It is shown that the maximum average‐data‐collection‐speed (ADCS) of multisection 2D hybrid‐RARE sequences is independent of TR and TE~eff~, and a monotonically increasing function of echo‐train‐length (ETL). This result was used in the design of an optimized T~1~‐weighted hybrid‐RARE sequence that produces 20 images of the abdomen in 31 s divided into four breath‐hold periods. The resulting ADCS is 58 lines in k‐space per second. Twenty‐four subjects (2 healthy volunteers and 22 patients) were imaged with a protocol that also included: (a) breath‐hold T~1~‐weighted FLASH which acquires data at 34 lines in k‐space per second (49 s scan time), and (b) T~1~‐weighted conventional spin‐echo (9:44 minutes scan time) with respiratory compensation. The experiments show that this T~1~‐weighted‐hybrid‐RARE sequence has: (1) a level of T~1~ weighting that is comparable with the conventional sequences, (2) very low vulnerability to susceptibility artifacts, (3) high data acquisition efficiency, and (4) higher SNR than T~1~‐weighted‐FLASH. In conclusion, the T~1~‐weighted‐hybrid‐RARE sequence described herein is an efficacious and reproducible technique for rapid imaging of the upper abdomen during suspended respiration.