โ Scribed by Oliver Natt; Vitaliy Bezkorovaynyy; Thomas Michaelis; Jens Frahm
No coin nor oath required. For personal study only.
This work describes the use of phased array coils for a quantification of absolute metabolite concentrations. The method is demonstrated for singleโvoxel localized proton MRS of human brain with an eightโelement receiveโonly head coil. It is based on the transmitter reference amplitude of the body coil used for RF transmission. A relative sensitivity of every element of the phased array coil is derived from a combination of two reference scans without water suppression that correspond to either the body coil in transmitโreceive mode or the phased array coil in conjunction with body coil excitation. Experimental results were obtained at 2.9 T for both phantoms and 12 human subjects in different locations of gray and white matter. The data demonstrate that the procedure is technically robust and without a penalty in measuring time. Moreover, it takes full advantage of the signalโtoโnoise gain for quantitative proton MRS and may be extended to other phased array coils without the need for a recalibration. Magn Reson Med 53:3โ8, 2005. ยฉ 2004 WileyโLiss, Inc.
๐ SIMILAR VOLUMES
## Abstract In order to determine metabolite concentrations in human skeletal muscles by __in vivo__ ^31^P MRS, different quantification methods were analyzed with regard to the accuracy and reproducibility of results and the simplicity of handling. Each quantification method comprised a calibratio
## Abstract We report a rare premenarchal case of massive ovarian edema in which high resolution MRI findings more accurately reflected characteristic pathologic changes of this condition compared with CT and ultrasound. A potential role of MR in preoperative diagnosis of massive ovarian edema is s