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Abstract #2284

Modified in-plane resolution with shorter acquisition time while maintaining high image quality T2-weighted prostate MRI

Stephen J. Riederer1, Eric A. Borisch1, Adam T Froemming1, Roger C. Grimm1, Sara Hassanzadeh1, Akira Kawashima2, Naoki Takahashi1, and John Thomas1
1Radiology, Mayo Clinic, Rochester, MN, United States, 2Radiology, Mayo Clinic Arizona, Phoenix, AZ, United States

Synopsis

Keywords: Prostate, Prostate, T2W, Fast Spin Echo

Motivation: The prostate imaging standard (PI-RADS) specifies high in-plane resolution (0.40mm frequency × 0.70mm phase) for T2-weighted spin-echo, but adherence is low.

Goal(s): Study if modification to equivalent pixel area allows improved performance.

Approach: Frequency resolution of a PI-RADS-adherent sequence was degraded to 0.50mm, allowing two-fold bandwidth reduction while maintaining 10 msec inter-echo time. Phase resolution was improved to 0.57mm, maintaining equivalent pixel area. BW reduction allowed two-fold averaging reduction.

Results: Across 62 prostate exams the average T2-WI acquisition time decreased by 23% (>50 sec). Image quality improved based on diagnostic quality (p<0.037) as well as PI-QUALv2 scores (p<0.015).

Impact: Modification of the PI-RADS minimum technical standard parameters in prostate T2-weighted imaging of 0.4mm frequency × 0.7mm phase in-plane resolution to allow equivalent pixel area allows reduction in acquisition time and improved image quality.

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