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Published in: CardioVascular and Interventional Radiology 5/2020

01-05-2020 | Interventional Radiology | Laboratory Investigation

Smartphone Augmented Reality CT-Based Platform for Needle Insertion Guidance: A Phantom Study

Authors: Rachel Hecht, Ming Li, Quirina M. B. de Ruiter, William F. Pritchard, Xiaobai Li, Venkatesh Krishnasamy, Wael Saad, John W. Karanian, Bradford J. Wood

Published in: CardioVascular and Interventional Radiology | Issue 5/2020

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Abstract

Objective

To develop and assess the accuracy of an augmented reality (AR) needle guidance smartphone application.

Methods

A needle guidance AR smartphone application was developed using Unity and Vuforia SDK platforms, enabling real-time displays of planned and actual needle trajectories. To assess the application’s accuracy in a phantom, eleven operators (including interventional radiologists, non-interventional radiology physicians, and non-physicians) performed single-pass needle insertions using AR guidance (n = 8) and CT-guided freehand (n = 8). Placement errors were measured on post-placement CT scans. Two interventional radiologists then used AR guidance (n = 3) and CT-guided freehand (n = 3) to navigate needles to within 5 mm of targets with intermediate CT scans permitted to mimic clinical use. The total time and number of intermediate CT scans required for successful navigation were recorded.

Results

In the first experiment, the average operator insertion error for AR-guided needles was 78% less than that for CT-guided freehand (2.69 ± 2.61 mm vs. 12.51 ± 8.39 mm, respectively, p < 0.001). In the task-based experiment, interventional radiologists achieved successful needle insertions on each first attempt when using AR guidance, thereby eliminating the need for intraoperative CT scans. This contrasted with 2 ± 0.9 intermediate CT scans when using CT-guided freehand. Additionally, average procedural times were reduced from 13.1 ± 6.6 min with CT-guided freehand to 4.5 ± 1.3 min with AR guidance, reflecting a 66% reduction.

Conclusions

All operators exhibited superior needle insertion accuracy when using the smartphone-based AR guidance application compared to CT-guided freehand. This AR platform can potentially facilitate percutaneous biopsies and ablations by improving needle insertion accuracy, expediting procedural times, and reducing radiation exposures.
Literature
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go back to reference Rosenthal M, State A, Lee J, Hirota G, Ackerman J, Keller K, et al. Augmented reality guidance for needle biopsies: an initial randomized, controlled trial in phantoms. Med Image Anal. 2002;6(3):313–20.CrossRef Rosenthal M, State A, Lee J, Hirota G, Ackerman J, Keller K, et al. Augmented reality guidance for needle biopsies: an initial randomized, controlled trial in phantoms. Med Image Anal. 2002;6(3):313–20.CrossRef
Metadata
Title
Smartphone Augmented Reality CT-Based Platform for Needle Insertion Guidance: A Phantom Study
Authors
Rachel Hecht
Ming Li
Quirina M. B. de Ruiter
William F. Pritchard
Xiaobai Li
Venkatesh Krishnasamy
Wael Saad
John W. Karanian
Bradford J. Wood
Publication date
01-05-2020
Publisher
Springer US
Published in
CardioVascular and Interventional Radiology / Issue 5/2020
Print ISSN: 0174-1551
Electronic ISSN: 1432-086X
DOI
https://doi.org/10.1007/s00270-019-02403-6

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