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Published in: International Journal of Computer Assisted Radiology and Surgery 5/2021

01-05-2021 | Prostate Cancer | Original Article

Initial phantom studies for an office-based low-field MR system for prostate biopsy

Authors: Selin Chiragzada, Eva Hellman, Duncan Michael, Ram Narayanan, Aleksandar Nacev, Dinesh Kumar

Published in: International Journal of Computer Assisted Radiology and Surgery | Issue 5/2021

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Abstract

Purpose

Prostate cancer is the second most prevalent cancer in US men, with about 192,000 new cases and 33,000 deaths predicted for 2020. With only a 31% 5-year survival rate for patients with an initial diagnosis of stage-four prostate cancer, the necessity for early screening and diagnosis is clear. In this paper, we present navigation accuracy results for Promaxo’s MR system intended to be used in a physician’s office for image-guided transperineal prostate biopsy.

Methods

The office-based low-field MR system was used to acquire images of prostate phantoms with needles inserted through a transperineal template. Coordinates of the estimated sample core locations in the office-based MR system were compared to ground truth needle coordinates identified in a 1.5T external reference scan. The error was measured as the distance between the planned target and the ground truth core center and as the shortest perpendicular distance between the planned target and the ground truth trajectory of the whole core.

Results

The average error between the planned target and the ground truth core center was 2.57 ± 1.02 mm, [1.93–3.21] 95% CI. The average error between the planned target to the actual core segment was 2.05 ± 1.24 mm, [1.53–2.56] 95% CI.

Conclusion

The average navigation errors were below the clinically significant threshold of 5 mm. The initial phantom results demonstrate the feasibility of the office-based system for prostate biopsy.
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Metadata
Title
Initial phantom studies for an office-based low-field MR system for prostate biopsy
Authors
Selin Chiragzada
Eva Hellman
Duncan Michael
Ram Narayanan
Aleksandar Nacev
Dinesh Kumar
Publication date
01-05-2021
Publisher
Springer International Publishing
Published in
International Journal of Computer Assisted Radiology and Surgery / Issue 5/2021
Print ISSN: 1861-6410
Electronic ISSN: 1861-6429
DOI
https://doi.org/10.1007/s11548-021-02364-7

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