Whole Prostate Volume and Shape Changes with the Use of an Inflatable and Flexible Endorectal Coil

Osman, Murat; Shebel, Haytham; Sankineni, Sandeep; Bernardo, Marcelino; Daar, Dagane; Wood, Bradford J.; Pinto, Peter A.; Choyke, Peter L.; Türkbey, Barış; Agarwal, Harsh

doi:10.1155/2014/903747

Cited by 6 publications

(6 citation statements)

References 36 publications

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“…MRI articles only appeared after 2003, but MRI appeared slightly more accurate, including all three articles that directly compared TRUS and MRI. TRUS could be expected to be more operator dependant than MRI and TRUS measurements are likely to be affected more by pressure on the prostate from the balloon than by an endorectal coil (ERC), although the ERC also involves a balloon that can affect the volume [ 40 ]. MRI software may include multifeature active shape models (MFA's) which provide an accurate, automated method of planimetric measurement [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

How Accurately Can Prostate Gland Imaging Measure the Prostate Gland Volume? Results of a Systematic Review

Christie

Sharpley

2019

Prostate Cancer

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Aim. The measurement of the volume of the prostate gland can have an influence on many clinical decisions. Various imaging methods have been used to measure it. Our aim was to conduct the first systematic review of their accuracy. Methods. The literature describing the accuracy of imaging methods for measuring the prostate gland volume was systematically reviewed. Articles were included if they compared volume measurements obtained by medical imaging with a reference volume measurement obtained after removal of the gland by radical prostatectomy. Correlation and concordance statistics were summarised. Results. 28 articles describing 7768 patients were identified. The imaging methods were ultrasound, computed tomography, and magnetic resonance imaging (US, CT, and MRI). Wide variations were noted but most articles about US and CT provided correlation coefficients that lay between 0.70 and 0.90, while those describing MRI seemed slightly more accurate at 0.80-0.96. When concordance was reported, it was similar; over- and underestimation of the prostate were variably reported. Most studies showed evidence of at least moderate bias and the quality of the studies was highly variable. Discussion. The reported correlations were moderate to high in strength indicating that imaging is sufficiently accurate when quantitative measurements of prostate gland volume are required. MRI was slightly more accurate than the other methods.

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Section: Discussionmentioning

confidence: 99%

How Accurately Can Prostate Gland Imaging Measure the Prostate Gland Volume? Results of a Systematic Review

Christie

Sharpley

2019

Prostate Cancer

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“…On the other hand, the use of endorectal balloons may affect the geometrical accuracy of treatment delivery. Studies using balloon‐type endorectal MRI coils demonstrated that endorectal balloons can cause deformations of the prostate 8,9 . Moreover, analyses of the interfraction variability in endorectal balloon placement relative to the prostate or bony landmarks reported substantial deviations in shape and position from the nominal geometry 10–12 .…”

Section: Introductionmentioning

confidence: 99%

“…Studies using balloon-type endorectal MRI coils demonstrated that endorectal balloons can cause deformations of the prostate. 8,9 Moreover, analyses of the interfraction variability in endorectal balloon placement relative to the prostate or bony landmarks reported substantial deviations in shape and position from the nominal geometry. [10][11][12] The intra-and interindividual dosimetric consequences of such residual deformations and repositioning inaccuracies on the delivered dose distributions in prostate radiotherapy with endorectal balloon are subject of this paper.…”

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confidence: 99%

Spatial and dosimetric evaluation of residual distortions of prostate and seminal vesicle bed after image‐guided definitive and postoperative radiotherapy of prostate cancer with endorectal balloon

Levegrün

Pöttgen

Xydis

et al. 2020

J Applied Clin Med Phys

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Purpose: To quantify daily residual deviations from the planned geometry after image-guided prostate radiotherapy with endorectal balloon and to evaluate their effect on the delivered dose distribution.Methods: Daily kV-CBCT imaging was used for online setup-correction in six degrees of freedom (6-dof) for 24 patients receiving definitive (12 RT def patients) or postoperative (12 RT postop patients) radiotherapy with endorectal balloon (overall 739 CBCTs). Residual deviations were evaluated using several spatial and dosimetric variables, including: (a) posterior Hausdorff distance HD post (=maximum distance between planned and daily CTV contour), (b) point P worst with largest HD post over all fractions, (c) equivalent uniform dose using a cell survival model (EUD SF ) and the generalized EUD concept (gEUD a with parameter a = −7 and a = −20). EUD values were determined for planned (EUD plan SF ), daily (EUD ind SF ), and delivered dose distributions (EUD accum SF ) for plans with 6 mm (=clinical plans) and 2 mm CTV-to-PTV margin. Time series analyses of interfractional spatial and dosimetric deviations were conducted.Results: Large HD post values ≥ 12.5 mm (≥15 mm) were observed in 20/739 (5/739) fractions distributed across 7 (3) patients. Points P worst were predominantly located at the posterior CTV boundary in the seminal vesicle region (16/24 patients, 6/7 patients with HD post ≥ 12.5 mm). Time series analyses revealed a stationary white noise characteristic of HD post and relative dose at P worst . The EUD SF difference between planned and accumulated dose distributions was < 5.4% for all 6-mm plans. Evaluating 2-mm plans, EUD SF deteriorated by < 10% (<5%) in 75% (58.5%) of the patients. EUD accum SF was well described by the median value of the EUD ind SF distribution. PTV margin calculation at P worst yielded 8.8 mm.Conclusions: Accumulated dose distributions in prostate radiotherapy with endorectal balloon are forgiving of considerable residual distortions after 6-dof patient setup if they are observed in a minority of fractions and the median value of EUD ind SF

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“…The probe and the prone position would, indeed, not alter the volume of the prostate but might deform its shape slightly. In their study, Osman et al [ 47 ] have investigated the endorectal coil effect on the WP volume and shape during prostate T2W MRI and concluded that, despite shape deformation, there is no significant change in the WP volume between including and excluding the endorectal coil. Although the needle guiding probe differs from the endorectal coil, its impact may be expected to be similar.…”

Section: Discussionmentioning

confidence: 99%

The Reproducibility of Deep Learning-Based Segmentation of the Prostate Gland and Zones on T2-Weighted MR Images

et al. 2021

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Volume of interest segmentation is an essential step in computer-aided detection and diagnosis (CAD) systems. Deep learning (DL)-based methods provide good performance for prostate segmentation, but little is known about the reproducibility of these methods. In this work, an in-house collected dataset from 244 patients was used to investigate the intra-patient reproducibility of 14 shape features for DL-based segmentation methods of the whole prostate gland (WP), peripheral zone (PZ), and the remaining prostate zones (non-PZ) on T2-weighted (T2W) magnetic resonance (MR) images compared to manual segmentations. The DL-based segmentation was performed using three different convolutional neural networks (CNNs): V-Net, nnU-Net-2D, and nnU-Net-3D. The two-way random, single score intra-class correlation coefficient (ICC) was used to measure the inter-scan reproducibility of each feature for each CNN and the manual segmentation. We found that the reproducibility of the investigated methods is comparable to manual for all CNNs (14/14 features), except for V-Net in PZ (7/14 features). The ICC score for segmentation volume was found to be 0.888, 0.607, 0.819, and 0.903 in PZ; 0.988, 0.967, 0.986, and 0.983 in non-PZ; 0.982, 0.975, 0.973, and 0.984 in WP for manual, V-Net, nnU-Net-2D, and nnU-Net-3D, respectively. The results of this work show the feasibility of embedding DL-based segmentation in CAD systems, based on multiple T2W MR scans of the prostate, which is an important step towards the clinical implementation.

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Whole Prostate Volume and Shape Changes with the Use of an Inflatable and Flexible Endorectal Coil

Cited by 6 publications

References 36 publications

How Accurately Can Prostate Gland Imaging Measure the Prostate Gland Volume? Results of a Systematic Review

How Accurately Can Prostate Gland Imaging Measure the Prostate Gland Volume? Results of a Systematic Review

Spatial and dosimetric evaluation of residual distortions of prostate and seminal vesicle bed after image‐guided definitive and postoperative radiotherapy of prostate cancer with endorectal balloon

The Reproducibility of Deep Learning-Based Segmentation of the Prostate Gland and Zones on T2-Weighted MR Images

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