Interactive prostate shape reconstruction from 3D TRUS images

Furuhata, Tomotake; Song, Inho; Zhang, Hong; Rabin, Yoed; Shimada, Kenji

doi:10.7315/jcde.2014.027

Cited by 14 publications

(14 citation statements)

References 14 publications

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“…However, reducing the PFAM to clinical practice requires further development, and the current study is aimed only at developing a low computation-cost method to meet that need. Reducing this method to practice can take advantage on a recently developed method for real-time segmentation of the visible portion of the frozen region [5]. …”

Section: Resultsmentioning

confidence: 99%

A new method for temperature-field reconstruction during ultrasound-monitored cryosurgery using potential-field analogy

2016

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The current study aims at developing computational tools in order to gain information about the thermal history in areas invisible to ultrasound imaging during cryosurgery. This invisibility results from the high absorption rate of the ultrasound energy by the frozen region, which leads to an apparent opacity in the cryotreated area and a shadow behind it. A proof-of-concept for freezing-front estimation is demonstrated in the current study, using the new potential-field analogy method (PFAM). This method is further integrated with a recently developed temperature-field reconstruction method (TFRM) to estimate the temperature distribution within the frozen region. This study uses prostate cryosurgery as a developmental model and trans-rectal ultrasound imaging as a choice of practice. Results of this study indicate that the proposed PFAM is a viable and computationally inexpensive solution to estimate the extent of freezing in the acoustic shadow region. Comparison of PFAM estimations and experimental data shows an average mismatch of less than 2 mm in freezing-front location, which is comparable to the uncertainty in ultrasound imaging. Comparison of the integrated PFAM+TFRM scheme with a full-scale finite-elements analysis (FEA) indicates an average mismatch of 0.9 mm for the freezing front location and 0.1 mm for the lethal temperature isotherm of −45°C. Comparison of the integrated PFAM+TFRM scheme with experimental temperature measurements show a difference in the range of 2°C and 6°C for selected points of measurement. Results of this study demonstrate the integrated PFAM+TFRM scheme as a viable and computationally inexpensive means to gain information about the thermal history in the frozen region during ultrasound-monitored cryosurgery.

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Section: Resultsmentioning

confidence: 99%

A new method for temperature-field reconstruction during ultrasound-monitored cryosurgery using potential-field analogy

2016

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“…For the latter application, automation can be employed in creating template deformations. For the latter two applications, computer generated surgical planning [3,7–14,38] can be compared with interactive trainee operation, where the differences are automatically quantified, while the entire process is monitored by an experienced clinician. Either way, medical training is not perceived as an independent study, and the presence of an experienced surgeon should provide additional feedback on the virtual operation, including the credibility of the computer generated shapes.…”

Section: Resultsmentioning

confidence: 99%

“…2 serves as the mainstay in developing a strategy to construct a database for candidate prostates for cryosurgery (up to T3-stage cancer). Model parameters selection for demonstration purposes in the current study is presented below, whereas database construction is a task left to be performed in concert with the tutoring code development [12,14]. …”

Section: Prostate Cancer and Tumor Growthmentioning

confidence: 99%

“…While improved computation techniques, optimization methods, and computer hardware are likely to have an impact on computerized planning, an extension of this line of research can lead to computerized training and education associated with cryosurgery [12–14]. One can envision a virtual cryosurgery setup, where a trainee practices creating an optimal 3D thermal field to conform to a particular organ shape at various stages of cancer.…”

Section: Introductionmentioning

confidence: 99%

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Generating prostate models by means of geometric deformation with application to computerized training of cryosurgery

2012

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Purpose As a part of an ongoing effort to develop computerized training tools for cryosurgery, this study presents a scheme to geometrically deform a 3D organ template in order to generate clinically relevant prostate models. The objective for creating deformed models is to develop a database for computerized training. This study further presents compiled literature data on the likelihood of cancer tumor growth in the prostate and its relationship to the prostate shape. Methods Cryosurgery is typically performed on patients with localized prostate cancer, found in stages T3 or earlier. The analysis is restricted to cancer originating from the peripheral zone of the prostate as majority of cancer cases are found within this region. The distribution of geometric features, likely to be found in prostates at stage T3, is determined using tumor growth patterns that attribute to changes in the prostate surface. The extended free-form deformation (EFFD) method is applied on a 3D prostate template to create localized surface changes that resemble cancerous prostates. Results Deformed prostate models were generated using the process of: (1) selecting the desired deformation parameters—extra capsular extension (ECE) range and location, and (2) manipulating the lattice control points until the deformed prostate model's ECE length and transverse span fall within the pre-selected ranges. Conclusions EFFD is an efficient method to rapidly generate prostate models for the application of computerized training of cryosurgery. While the selected criteria for deformation do not lead to a unique shape, since the contours of the deformed body are randomly selected, they do lead to shapes resembling cancer growth, as various growth histories can lead to different ECE shapes of the same maximum extension.

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“…Prostate cryosurgery presents a unique challenge where many cryoprobes are operated simultaneously, which demands high computation performance for real-time simulations. A previous study has characterized the evolution of prostate cancer as it pertains to geometric deformations (16), while another study addressed reconstruction of organ models from clinical data (35). With the current computation capabilities in mind, future studies can now expand on additional cryosurgical applications, when the geometries of the cancer tumors or the cancerous organ become available.…”

Section: Discussionmentioning

confidence: 99%

Graphics Processing Unit-Based Bioheat Simulation to Facilitate Rapid Decision Making Associated with Cryosurgery Training

Keelan

Zhang

Shimada

et al. 2015

Technol Cancer Res Treat

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This study focuses on the implementation of an efficient numerical technique for cryosurgery simulations on a graphics processing unit (GPU) as an alternative means to accelerate run time. This study is part of an ongoing effort to develop computerized training tools for cryosurgery, with prostate cryosurgery as a developmental model. The ability to perform rapid simulations of varying test cases is critical to facilitate sound decision making associated with medical training. Consistent with clinical practice, the training tool aims at correlating the frozen region contour and the corresponding temperature field with the target region shape. The current study focuses on the feasibility of GPU-based computation using C++ accelerated massive parallelism (AMP), as one possible implementation. Benchmark results on a variety of computation platforms display between three-fold acceleration (laptop) and thirteen-fold acceleration (gaming computer) of cryosurgery simulation, in comparison with the more common implementation on a multi-core central processing unit (CPU). While the general concept of GPU-based simulations is not new, its application to phase-change problems, combined with the unique requirements for cryosurgery optimization, represents the core contribution of the current study.

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Interactive prostate shape reconstruction from 3D TRUS images

Cited by 14 publications

References 14 publications

A new method for temperature-field reconstruction during ultrasound-monitored cryosurgery using potential-field analogy

A new method for temperature-field reconstruction during ultrasound-monitored cryosurgery using potential-field analogy

Generating prostate models by means of geometric deformation with application to computerized training of cryosurgery

Graphics Processing Unit-Based Bioheat Simulation to Facilitate Rapid Decision Making Associated with Cryosurgery Training

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