Key result
Flow-suppressed single-breath-hold pulmonary vascular MRI marginally increases imaging time vs conventional techniques.
Why the study?
A method for pulmonary vascular MR imaging with venous or arterial flow suppression that enables single breath-hold acquisition with selective flow direction was needed to improve imaging efficiency.
Does a modified presaturation pulse sequence reduce imaging time compared to conventional flow-suppression in pulmonary vascular MR imaging?
Does a modified presaturation pulse sequence reduce imaging time compared to conventional flow-suppression in pulmonary vascular MR imaging?
The proposed MR imaging method enables venous or arterial flow-suppressed pulmonary vascular imaging within a single breath hold by only marginally increasing imaging time.
Supports single-breath-hold flow-suppressed pulmonary vascular MR; leaves open whether this improves diagnostic performance or warrants clinical adoption.
A method for acquiring pulmonary vascular magnetic resonance (MR) images with either venous or arterial flow suppression is described. The proposed method only marginally increases the overall imaging time compared with conventional flow-suppression techniques. This enables an acquisition to be completed within a single breath hold with some selectivity as to flow direction. Instead of applying a spatially selective presaturation pulse before each radio-frequency (RF) excitation pulse, the flow presaturation pulse is applied once every 16-20 RF excitation pulses. To avoid image artifacts and to maintain a steady state, each presaturation pulse interval is followed by a normal imaging segment but with data acquisition turned off. Overall imaging time is increased by two TR intervals for each presaturation segment. For a 256 x 128 matrix acquisition, venous flow presaturation increases overall imaging time by approximately 14 TR intervals, while arterial flow suppression increases imaging time by 10 TR intervals.
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Foo et al. (1993) studied this question. Single-breath-hold venous or arterial flow-suppressed pulmonary vascular MR imaging vs. Conventional flow-suppression techniques was evaluated on Overall imaging time. Single-breath-hold pulmonary vascular MR imaging with venous or arterial flow suppression marginally increased overall imaging time by 10 to 14 TR intervals compared to conventional techniques.
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