Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification
Purpose: To investigate the effect of increasing navigation speed on (a) readers’ visual search and (b) decision-making during polyp identification for CT colonography (CTC). 2 Methods: Ethical permission was granted for this prospective study. Following informed consent, twelve CTC fly-through exam...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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Radiological Society of North America
2017
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| _version_ | 1826288773082644480 |
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| author | Plumb, A Phillips, P Spence, G Mallett, S Taylor, S Halligan, S Fanshawe, T |
| author_facet | Plumb, A Phillips, P Spence, G Mallett, S Taylor, S Halligan, S Fanshawe, T |
| author_sort | Plumb, A |
| collection | OXFORD |
| description | Purpose: To investigate the effect of increasing navigation speed on (a) readers’ visual search and (b) decision-making during polyp identification for CT colonography (CTC). 2 Methods: Ethical permission was granted for this prospective study. Following informed consent, twelve CTC fly-through examinations (depicting 8 polyps) were presented at four different fixed navigation speeds to 23 radiologists. Speeds ranged from 1cm/s to 4.5cm/s. Gaze position was tracked using an infra-red eye-tracker, and readers indicated seeing a polyp by clicking a mouse. Patterns of search and decision-making by speed were investigated graphically and by multi-level modelling. Results: Readers identified polyps correctly in 73% of viewings at the slowest speed but only 61% of viewings at the fastest (p=0.004). They also identified fewer false positive features at faster speeds (37% of videos at slowest speed, 26% at fastest, p=0.02). Gaze location was highly concentrated towards the central quarter of the screen area at faster speeds (mean 86% of gaze points at slowest speed, 97% at fastest speed). Conclusions: Faster navigation speed at endoluminal CTC leads to progressive restriction of visual search patterns. Greater speed also reduces both true-positive and false-positive colorectal polyp identification. |
| first_indexed | 2024-03-07T02:18:46Z |
| format | Journal article |
| id | oxford-uuid:a33066c8-ec20-42f6-bc0a-ae180733ac41 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:18:46Z |
| publishDate | 2017 |
| publisher | Radiological Society of North America |
| record_format | dspace |
| spelling | oxford-uuid:a33066c8-ec20-42f6-bc0a-ae180733ac412022-03-27T02:25:06ZIncreasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identificationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a33066c8-ec20-42f6-bc0a-ae180733ac41Symplectic Elements at OxfordRadiological Society of North America2017Plumb, APhillips, PSpence, GMallett, STaylor, SHalligan, SFanshawe, TPurpose: To investigate the effect of increasing navigation speed on (a) readers’ visual search and (b) decision-making during polyp identification for CT colonography (CTC). 2 Methods: Ethical permission was granted for this prospective study. Following informed consent, twelve CTC fly-through examinations (depicting 8 polyps) were presented at four different fixed navigation speeds to 23 radiologists. Speeds ranged from 1cm/s to 4.5cm/s. Gaze position was tracked using an infra-red eye-tracker, and readers indicated seeing a polyp by clicking a mouse. Patterns of search and decision-making by speed were investigated graphically and by multi-level modelling. Results: Readers identified polyps correctly in 73% of viewings at the slowest speed but only 61% of viewings at the fastest (p=0.004). They also identified fewer false positive features at faster speeds (37% of videos at slowest speed, 26% at fastest, p=0.02). Gaze location was highly concentrated towards the central quarter of the screen area at faster speeds (mean 86% of gaze points at slowest speed, 97% at fastest speed). Conclusions: Faster navigation speed at endoluminal CTC leads to progressive restriction of visual search patterns. Greater speed also reduces both true-positive and false-positive colorectal polyp identification. |
| spellingShingle | Plumb, A Phillips, P Spence, G Mallett, S Taylor, S Halligan, S Fanshawe, T Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title | Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title_full | Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title_fullStr | Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title_full_unstemmed | Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title_short | Increasing navigation speed at endoluminal CT colonography reduces colonic visualisation and polyp identification |
| title_sort | increasing navigation speed at endoluminal ct colonography reduces colonic visualisation and polyp identification |
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