Detection of lactate with a hadamard slice selected, selective multiple quantum coherence, chemical shift imaging sequence (HDMD-SelMQC-CSI) on a clinical MRI scanner: Application to tumors and muscle ischemia
✍ Scribed by Eric A. Mellon; Seung-Cheol Lee; Stephen Pickup; Sungheon Kim; Steven C. Goldstein; Thomas F. Floyd; Harish Poptani; E. James Delikatny; Ravinder Reddy; Jerry D. Glickson
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 607 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
Lactate is an important metabolite in normal and malignant tissues detectable by NMR spectroscopy; however, it has been difficult to clinically detect the lactate methyl resonance because it is obscured by lipid resonances. The selective homonuclear multiple quantum coherence transfer technique offers a method for distinguishing lipid and lactate resonances. We implemented a three‐dimensional selective homonuclear multiple quantum coherence transfer version with Hadamard slice selection and two‐dimensional phase encoding (Hadamard encoded–selective homonuclear multiple quantum coherence transfer–chemical shift imaging) on a conventional clinical MR scanner. Hadamard slice selection is explained and demonstrated in vivo. This is followed by 1‐cm^3^ resolution lactate imaging with detection to 5‐mM concentration in 20 min on a 3‐T clinical scanner. An analysis of QSel gradient duration and amplitude effects on lactate and lipid signal is presented. To demonstrate clinical feasibility, a 5‐min lactate scan of a patient with a non‐Hodgkin's lymphoma in the superficial thigh is reported. The elevated lactate signal coincides with the T~2~‐weighted image of this tumor. As a test of selective homonuclear multiple quantum coherence transfer sensitivity, a thigh tourniquet was applied to a normal volunteer and an increase in lactate was detected immediately after tourniquet flow constriction. In conclusion, the Hadamard encoded–selective homonuclear multiple quantum coherence transfer–chemical shift imaging sequence is demonstrated on a phantom and in two lipid‐rich, clinically relevant, in vivo conditions. Magn Reson Med, 2009. © 2009 Wiley‐Liss, Inc.