Abstract
Objectives
To estimate the required spatial alignment accuracy for correctly grading 95 % of peripheral zone (PZ) prostate cancers using a system for multiparametric magnetic resonance (MR)-guided ultrasound (US) biopsies.
Methods
PZ prostate tumours were retrospectively annotated on multiparametric MR series using prostatectomy specimens as reference standard. Tumours were grouped based on homogeneous and heterogeneous apparent diffusion coefficient (ADC) values using an automated ADC texture analysis method. The proportion of heterogeneous tumours containing a distinct, high Gleason grade tumour focus yielding low ADC values was determined. Both overall tumour and high-grade focal volumes were calculated. All high-grade target volumes were then used in a simulated US biopsy system with adjustable accuracy to determine the hit rate.
Results
An ADC-determined high-grade tumour focus was found in 63 % of the PZ prostate tumours. The focal volumes were significantly smaller than the total tumour volumes (median volume of 0.3 ml and 1.1 ml respectively). To correctly grade 95 % of the aggressive tumour components the target registration error (TRE) should be smaller than 1.9 mm.
Conclusions
To enable finding the high Gleason grade component in 95 % of PZ prostate tumours with MR-guided US biopsies, a technical registration accuracy of 1.9 mm is required.
Key Points
• MRI can identify foci of prostatic cancer with reduced apparent diffusion coefficients
• Sixty-three per cent of prostatic peripheral zone tumours contain high-grade tumour low ADC foci
• The median volume of such foci is 0.3 ml
• Biopsy targets are significantly smaller than whole tumour volumes
• Simulated registration accuracy is 1.9 mm for correctly grading 95 % of tumours
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- DWI:
-
Diffusion-weighted imaging
- MR:
-
Magnetic resonance
- MRI:
-
Magnetic resonance imaging
- PZ:
-
Peripheral zone
- RMS:
-
Root mean square
- TRE:
-
Target registration error
- TRUS:
-
Transrectal ultrasound
- US:
-
Ultrasound
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Acknowledgements
This work was funded by grant no. KUN 2007-3971 of the Dutch Cancer Society.
The cohort used in this article was previously reported by Hambrock et al. in Radiology (T. Hambrock, D.M. Somford, H.J. Huisman, I.M. van Oort, J.A. Witjes, C.A. Hulsbergen van de Kaa, T. Scheenen, and J.O. Barentsz. Relationship between apparent diffusion coefficients at 3.0-T MR imaging and Gleason grade in peripheral zone prostate cancer. Radiology, 259(2):453–461 2011.) This population was used in that article to assess whether there was a correlation between ADC and tumour aggressiveness. In our article we use this population to investigate the (focal) tumour volumes and estimate the required accuracy for MR-US fusion.
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van de Ven, W.J.M., Hulsbergen–van de Kaa, C.A., Hambrock, T. et al. Simulated required accuracy of image registration tools for targeting high-grade cancer components with prostate biopsies. Eur Radiol 23, 1401–1407 (2013). https://doi.org/10.1007/s00330-012-2701-1
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DOI: https://doi.org/10.1007/s00330-012-2701-1