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

From: Understanding PI-QUAL for prostate MRI quality: a practical primer for radiologists


Imaging planes

Slice thickness


In-plane dimension

Specific recommendations

T2w imaging

Same used for DWI and DCE

3 mm

12–20 cma

 ≤ 0.7 mm (phase) ×  ≤ 0.4 mm (frequency)

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)

3D axial as an adjunct to 2D acquisitions


No gap



Same used for T2w imaging and DCE

 ≤ 4 mm

16–22 cm

 ≤ 2.5 mm (phase and frequency)

Low b value: 50–100 s/mm2

Intermediate b value: 800–1000 s/mm2

High b value


No gap


Dedicated (≥ 1400 s/mm2)


Synthesised (from other b values)


Same used for T2w imaging and DWI

3 mm

No specific recommendationsa

 ≤ 2 mm (phase and frequency)

Temporal resolution ≤ 15 s

GBCA: 0.1 mmol/kg

Fat suppression


No gap


Injection rate: 2–3 cc/s


Observation rate  ≥ 2 min

  1. T2w imaging T2-weighted imaging, DWI diffusion-weighted imaging, DCE dynamic contrast enhanced, FOV field of view, GBCA gadolinium-based contrast agent
  2. aTo encompass the entire prostate gland and seminal vesicles