Abstract
Introduction For tissue phase mapping (TPM) the suppression of the blood pool is necessary to reduce flow related artifacts. Black blood contrast in CINE imaging can be obtained using spatial presaturation. At high field MR systems, however, spatial presaturation considerably increases the specific absorption rate (SAR). Due to SAR limitations the number of measured heart phases is limited, since idle times have to be introduced into the sequence.
Highlights
For tissue phase mapping (TPM) the suppression of the blood pool is necessary to reduce flow related artifacts
Due to specific absorption rate (SAR) limitations the number of measured heart phases is limited, since idle times have to be introduced into the sequence
For the reduced SAR sequences the number of maximum heart phases is 21 for 60 bpm compared to 13 bpm for the sequence without SAR reduction
Summary
For tissue phase mapping (TPM) the suppression of the blood pool is necessary to reduce flow related artifacts. Black blood contrast in CINE imaging can be obtained using spatial presaturation. At high field MR systems, spatial presaturation considerably increases the specific absorption rate (SAR). Due to SAR limitations the number of measured heart phases is limited, since idle times have to be introduced into the sequence. Were chosen since this flip angle allows the same heartphase number as the alternated application of saturation pulses approach. For the reduced SAR sequences the number of maximum heart phases is 21 for 60 bpm compared to 13 bpm for the sequence without SAR reduction. For comparison of the methods, the blood-myocardial contrast and the correlation coefficient between the obtained radial velocity curves were calculated
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