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Erschienen in: European Radiology 3/2012

01.03.2012 | Urogenital

What is the optimal b value in diffusion-weighted MR imaging to depict prostate cancer at 3T?

verfasst von: T. Metens, D. Miranda, J. Absil, C. Matos

Erschienen in: European Radiology | Ausgabe 3/2012

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Abstract

Objective

To determine an optimal b value to visualise prostate cancer using diffusion-weighted magnetic resonance imaging at 3 T.

Methods

Forty one patients with biopsy proven prostate cancer underwent 3 T diffusion-weighted MRI performed with 5 b values (0, 1,000, 1,500, 2,000, 2,500 s/mm2) using a 16-channel coil. Best lesion visibility, the central gland-lesion (CG-L) and the peripheral zone-lesion (PZ-L) contrast-to-noise ratio (CNR) were compared between different b value images, apparent diffusion coefficient (ADC) were measured. In a subset of 29 patients a high resolution b1,500 s/mm2diffusion-weighted sequence was additionally assessed.

Results

The b = 1,500 s/mm2 and b = 2,000 s/mm2 images provided the best lesion visibility respectively in 27/41 and in 10/41patients. The highest CG-L and PZ-L CNR were obtained with b = 1,500 s/mm2 (P < 0.0001). The mean ADC value calculated from 0 to 1,500 s/mm2 b values in cancer lesions (ADC = 736 ± 173 10−6 mm2/s) was statistically significantly lower than in the peripheral zone (ADC = 1,338 ± 256 10−6 mm2/s, P < 0.0001) and in the central gland (ADC = 1,270 ± 239 10−6 mm2/s, P < 0.0001). The high resolution diffusion sequence was judged of better lesion visibility than (17/29) or equivalent to (6/29) the best images from the 5b sequence.

Conclusion

At 3 T, prostate cancer lesions are best depicted with b = 1,500 s/mm2 and b = 2,000 s/mm2 images, b = 1,500 s/mm2 high-resolution diffusion images improve the image quality and contrast.

Key Points

Multiple b ≥ 1,000 s/mm 2 3 T-DW Magnetic Resonance Imaging provides excellent prostate cancer depiction.
Prostate DWI and ADC maps are attainable at 3 T without endorectal coil.
Prostate cancer depiction is improved on high resolution b 1,500 s/mm 2 3 T-DWI.
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Metadaten
Titel
What is the optimal b value in diffusion-weighted MR imaging to depict prostate cancer at 3T?
verfasst von
T. Metens
D. Miranda
J. Absil
C. Matos
Publikationsdatum
01.03.2012
Verlag
Springer-Verlag
Erschienen in
European Radiology / Ausgabe 3/2012
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-011-2298-9

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