A Critical Analysis of the Effect of View Mode and Frame Rate on Reading Time and Lesion Detection During Capsule Endoscopy

Abstract

Both VM and FR significantly influence lesion detection during capsule endoscopy reading.

Optimising the performance and interpretation of small bowel capsule endoscopy

“…This confirmed that increased speed was associated with an increased chance of missing lesions. The optimal setting was found to be QV overlapping at 10 fps (detecting 51 of the 60 lesions), compared with the one image setting at 25 fps which detected just 14 43. This is supported by a study examining the most commonly used reading combinations, which found SV at 25 fps had a mean diagnostic yield of 26%, compared with 45% when reading SV at 15 fps.…”

Quality Indicators for Small Bowel Capsule Endoscopy

“…However, the appropriate selection image number at the monitor improves reading efficiency and detection rate of interpreters reading CE [63]. Currently, softwares for CE reading have several view mode options, including SingleView, DualView, and QuadView, according to the number of images shown in one monitor [64].…”

“…In a survey including 530 members of the American College of Gastroenterology, SingleView, DualView, and QuadView were used by 23.7%, 40.4%, and 54.5%, respectively [65]. QuadView has a theoretical advantage of longer single frame exposure time compared to SingleView, helping interpreters in detecting more lesions [63,66] However, QuadView might have a drawback of making readers rely on their peripheral vision because of simultaneous focusing on several images [66]. …”

“…The playing time from the entry of the capsule into the duodenal bulb to the cecum, without the video being stopped once started, was determined by 11 different combinations of video mode and frame rates in order to evaluate the impact of view mode on reading time and detection rates of lesions. There was no difference in reading time according to view mode at the same frame rate [63]. However, detection rate was higher in DualView or QuadView than in SingleView: 56% in SingleView, 83% in DualView, and 85% in QuadView at 10 frames per second (f.p.s).…”

“…Currently, these softwares provide a various range of frame rates allowing reduction of reading time of thousands of capsule’s images [64]. In a study evaluating the effect of frame rate on reading time and detection rate, slower frame rate increased reading time irrespective of view mode options: compared to 10 f.p.s, the mean playing time of videos shortened by 33%, 61%, and 72% in 15, 25, and 40 f.p.s, respectively [63]. In contrast, when interpreters were asked to manually count angioectasia of each positive image from video clips, detection rates calculated using maximum number of positive images were 75% in 10 f.p.s, 51% in 15 f.p.s, and 36% in 25 f.p.s.…”