A pilot evaluation of the R2 image checker system and users' response in the detection of interval breast cancers on previous screening films.

Abstract:

AIM:Breast screening radiologists are under considerable pressure to maximize cancer detection and minimize the number of interval cancers. This study used screening films, previously reported as normal, taken before the development of an interval cancer. The aim was to determine the sensitivity and specificity of the R2 Image Checker System and the responses of users in detecting abnormalities in these previous films. MATERIALS AND METHODS:The first R2 Image Checker System in the U.K. was installed in the Canterbury Assessment Centre for evaluation purposes. System performance was compared with the standard protocol for assessing interval cancers used in the NHS Breast Screening Programme (NHSBSP) Three readers examined the previous films blind before switching on R2 and compared the prompts generated with the location of the subsequent interval cancer. RESULTS:The previous screening films for 104 cases generated 134 R2 prompts on the subsequent cancer side and 109 on the non-cancer side. Readers classified 29 cancers as false-negative or minimal signs and R2 correctly prompted in 15 of these cases (52%). At least one reader rejected the correct prompt in five cases. CONCLUSION:From this preliminary study it appears that R2 overprompts normal areas and underprompts some cancers in these difficult cases. A full multi-centre evaluation is needed to assess the possible contribution of R2 to the NHSBSP.

journal_name

Clin Radiol

journal_title

Clinical radiology

authors

Garvican L,Field S

doi

10.1053/crad.2001.0776

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

833-7

issue

10

eissn

0009-9260

issn

1365-229X

pii

S0009-9260(01)90776-7

journal_volume

56

pub_type

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