Endoscopic Measurement of Polyp Size Using a Novel Calibrated Hood

Kume, Keiichiro; Watanabe, Tatsuyuki; Yoshikawa, Ichiro; Harada, Masaru

doi:10.1155/2014/714294

Cited by 16 publications

(15 citation statements)

References 11 publications

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“…The discrepancy may be due to the difficulty in aligning the forceps along the largest diameter of the polyp and the limitations in forceps length and shape. Other measuring devices including a calibrated hood and probe also have been utilized to improve the accuracy of polyp size estimation, with the latter measuring polyp size within 5% of the post-polypectomy specimen size [ 16 , 18 ]. The linear probe, with markings on the distal flexible tip, is advanced through the endoscope and aligned against the largest diameter of the polyp for measurement.…”

Section: Discussionmentioning

confidence: 99%

Mis-sizing of Adenomatous Polyps is Common among Endoscopists and Impacts Colorectal Cancer Screening Recommendations

et al. 2018

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Background/AimsTo determine the accuracy of identifying ≥6-mm adenomatous polyps during colonoscopy and define its impact on subsequent interval screening. MethodsWe conducted a retrospective study of patients who underwent colonoscopies at Banner University Medical Center, Tucson from 2011 to 2015. All patients with ≥6-mm adenomatous polyps based on their colonoscopy report were included. Adenomatous polyps were excluded if they did not meet the criteria. Discrepancies in the polyp size were determined by calculating the percentage of size variation (SV). Clinical mis-sizing was defined as SV >33%. ResultsThe polyps analyzed were predominantly <10 mm in size. Approximately 13% of the examined polyps met the inclusion criteria, and 40.7% of the adenomas were ≥10 mm. A total of 189 ≥6-mm adenomatous polyps were collected from 10 different gastroenterologists and a colorectal surgeon. Adenomatous polyps were clinically mis-sized in 56.6% of cases and overestimated in 71.4%. Among the adenomas reviewed, 22% of mis-sized polyps and 11% of non-mis-sized polyps resulted in an inappropriate surveillance interval. ConclusionsWe found that more than half of ≥6-mm adenomatous polyps are mis-sized and that there is a tendency to overestimate adenoma size among endoscopists. This frequently leads to inappropriate intervals of surveillance colonoscopy.

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Section: Discussionmentioning

confidence: 99%

Mis-sizing of Adenomatous Polyps is Common among Endoscopists and Impacts Colorectal Cancer Screening Recommendations

et al. 2018

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“…Recent data suggest that, with visual estimation, substantial variations in recorded polyp size occur, leading to incorrect surveillance intervals in 10% of cases [ 65 , 66 ]. To date there is no digital tool to assist with polyp sizing and traditional methods, such as comparison with biopsy forceps and snares, add little to accuracy [ 67 ]. While a ‘digital ruler’ using AR might require a second camera, several endoscopes already incorporate multiple lenses, and innovative reference points may ultimately enable accurate measurement with standard single-camera endoscopes.…”

Section: Other Potential Ar Applications In Gi Endoscopymentioning

confidence: 99%

Computer vision and augmented reality in gastrointestinal endoscopy: Figure 1.

Mahmud

Cohen

Tsourides

et al. 2015

Gastroenterol. Rep.

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Augmented reality (AR) is an environment-enhancing technology, widely applied in the computer sciences, which has only recently begun to permeate the medical field. Gastrointestinal endoscopy—which relies on the integration of high-definition video data with pathologic correlates—requires endoscopists to assimilate and process a tremendous amount of data in real time. We believe that AR is well positioned to provide computer-guided assistance with a wide variety of endoscopic applications, beginning with polyp detection. In this article, we review the principles of AR, describe its potential integration into an endoscopy set-up, and envisage a series of novel uses. With close collaboration between physicians and computer scientists, AR promises to contribute significant improvements to the field of endoscopy.

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“…16 This technology may also have applications to upper tract malignancy (e.g., determination of urothelial tumor size and area of tumor involvement) and stricture disease (e.g., measurement of ureteral caliber before and after endoscopic treatment). There may also be relevance to gastrointestinal endoscopy, where recent studies have described ruler-like adjuncts that could be installed onto an endoscope, 17 unlike this study in which measurements were entirely digital. Alongside technical studies to ensure accurate measurement of nonstone targets, these examples highlight the broad applicability of real-time measurement technologies in endoscopic procedures.…”

Section: Discussionmentioning

confidence: 99%

Integrated Real-Time Digital Measurement During Ureteroscopic Procedures for Nephrolithiasis: A Workflow Feasibility Study

Koo

Aro

Becker

et al. 2020

Journal of Endourology

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Introduction: Accurate estimation of stone fragment size during ureteroscopic lithotripsy procedures facilitates operative efficiency and predicts the safety of fragment extraction or spontaneous passage. Using a novel stone measurement software application, this study assesses the feasibility of performing integrated real-time digital stone measurement during ureteroscopy. Methods: This workflow feasibility study was conducted in two phases. First, in the ex vivo simulation, mock stone fragments were placed in a renal collecting system training model. A basket extraction task was performed using a digital ureteroscope, with and without digital stone measurement. The time required to perform the tasks was recorded and compared. Second, in the in vivo workflow trial, adult patients undergoing ureteroscopic stone procedures were prospectively enrolled. Intraoperative measurements of stone fragments were performed to determine the time required to complete the measurements. Technical failures and perioperative complications were recorded. Results: In the ex vivo simulation, 20 mock stones mimicking varied fragmentation conditions were tested in the training model. The mean completion time of the basketing task without vs with digital stone measurement was 16.5 seconds (range 10.2-33.7) vs 38.9 seconds (range 27.2-60.0). Mean additional time required to measure stones was 22.3 seconds (range 8.4-42.7). In the in vivo workflow trial, nine patients undergoing ureteroscopy were enrolled. A median of five fragments (range 3-10) were measured in each patient. Mean completion time for each measurement was 10.1 seconds (range 8.2-12.8). Mean total time required to perform digital measurement per procedure was 50.8 seconds (range 25.9-99.0). No technical failures or clinical complications were observed. Conclusions: Integrating real-time digital stone measurement during ureteroscopy is safe and feasible. The findings support clinical trials of digital stone measurement to enhance intraoperative decision-making during ureteroscopy.

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Endoscopic Measurement of Polyp Size Using a Novel Calibrated Hood

Cited by 16 publications

References 11 publications

Mis-sizing of Adenomatous Polyps is Common among Endoscopists and Impacts Colorectal Cancer Screening Recommendations

Mis-sizing of Adenomatous Polyps is Common among Endoscopists and Impacts Colorectal Cancer Screening Recommendations

Computer vision and augmented reality in gastrointestinal endoscopy: Figure 1.

Integrated Real-Time Digital Measurement During Ureteroscopic Procedures for Nephrolithiasis: A Workflow Feasibility Study

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