Abstract
PurposeA 32-channel parallel transmit (pTx) add-on for 7 Tesla whole-body imaging is presented. First results are shown for phantom and in-vivo imaging.MethodsThe add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control computer, and an integrated 32-channel transmit/receive body array. B1+ maps in a phantom as well as B1+ maps and structural images in large volunteers are acquired to demonstrate the functionality of the system. EM simulations are used to ensure safe operation.ResultsGood agreement between simulation and experiment is shown. Phantom and in-vivo acquisitions show a field of view of up to 50 cm in z-direction. Selective excitation with 100 kHz sampling rate is possible. The add-on system does not affect the quality of the original single-channel system.ConclusionThe presented 32-channel parallel transmit system shows promising performance for ultra-high field whole-body imaging.
Highlights
Since the early days of MRI, a constant drive to higher main magnetic field strengths (B0) has existed
Using 8- and 16-channel transmit systems, an increasing number of clinical feasibility studies at 7T have aimed at regions where imaging is hampered by severe transmit inhomogeneities, for example liver [16, 17], kidneys [18], prostate [19,20,21], female pelvis [22], the hip joints [23, 24], shoulder [25, 26], the heart [27], the spinal cord [28], and the breasts [29, 30], or they cover extended regions such as the complete lower extremities [31]
In this paper we present a 32-channel transmit system add-on for 7T, including modulator system, power amplifiers, and specific absorption rate (SAR) supervision system
Summary
The add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control computer, and an integrated 32-channel transmit/receive body array.
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