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Table 1 Minimal technical requirements for multiparametric prostate MRI according to the PI-RADS v. 2.1 guidelines

From: Multiparametric prostate MRI quality assessment using a semi-automated PI-QUAL software program

  Axial T2-weighted imaging (T2-WI) Diffusion-weighted imaging (DWI) Dynamic contrast-enhanced (DCE)
Imaging planes The same used for DWI and DCE The same used for T2-WI and DCE The same used for T2-WI and DWI
Slice thickness 3 mm, no gap ≤ 4 mm, no gap 3 mm, no gap
Field of view 12–20 cm (to encompass the entire prostate gland and seminal vesicles) 16–22 cm 12–20 cm (to encompass the entire prostate gland and seminal vesicles)
In-plane resolution ≤ 0.7 mm (phase) × ≤ 0.4 mm (frequency) ≤ 2.5 mm (phase and frequency) ≤ 2 mm (phase and frequency)
Specific recommendations
T2-WI acquisition Axial plane: either straight axial to the patient or in an oblique axial plane matching the long axis of the prostate. At least one additional orthogonal plane (sagittal and/or coronal). Three-dimensional axial as an adjunct to two-dimensional acquisitions
Low b value 50–100 s/mm2
Intermediate b value 800–1,000 s/mm2
High b value Dedicated (≥ 1,400 s/mm2)
Synthesised (from other b values)
Temporal resolution ≤ 15 s
Total observation time >  2 min
Dose of Gd-based contrast agent 0.1 mmol/kg
Injection rate 2–3 cc/s
Fat suppression and/or subtraction Recommended