Introduction of heat map to fidelity assessment of compressed CT images

Lee, Hyunna; Kim, Bohyoung; Kim, Kil Joong; Seo, Jinwook; Park, Seong-Jin; Shin, Yeong-Gil; Lee, Kyung Ho

doi:10.1118/1.3611046

Cited by 8 publications

(2 citation statements)

References 16 publications

(36 reference statements)

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“…To provide a visual representation of the five readers' responses, a heat map was constructed ( Fig. 2 ) ( 22 ). Representative examples of nodule classification are shown in Figures 3 and 4 .…”

Section: Resultsmentioning

confidence: 99%

Nodule Classification on Low-Dose Unenhanced CT and Standard-Dose Enhanced CT: Inter-Protocol Agreement and Analysis of Interchangeability

et al. 2018

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ObjectiveTo measure inter-protocol agreement and analyze interchangeability on nodule classification between low-dose unenhanced CT and standard-dose enhanced CT.Materials and MethodsFrom nodule libraries containing both low-dose unenhanced and standard-dose enhanced CT, 80 solid and 80 subsolid (40 part-solid, 40 non-solid) nodules of 135 patients were selected. Five thoracic radiologists categorized each nodule into solid, part-solid or non-solid. Inter-protocol agreement between low-dose unenhanced and standard-dose enhanced images was measured by pooling κ values for classification into two (solid, subsolid) and three (solid, part-solid, non-solid) categories. Interchangeability between low-dose unenhanced and standard-dose enhanced CT for the classification into two categories was assessed using a pre-defined equivalence limit of 8 percent.ResultsInter-protocol agreement for the classification into two categories {κ, 0.96 (95% confidence interval [CI], 0.94–0.98)} and that into three categories (κ, 0.88 [95% CI, 0.85–0.92]) was considerably high. The probability of agreement between readers with standard-dose enhanced CT was 95.6% (95% CI, 94.5–96.6%), and that between low-dose unenhanced and standard–dose enhanced CT was 95.4% (95% CI, 94.7–96.0%). The difference between the two proportions was 0.25% (95% CI, −0.85–1.5%), wherein the upper bound CI was markedly below 8 percent.ConclusionInter-protocol agreement for nodule classification was considerably high. Low-dose unenhanced CT can be used interchangeably with standard-dose enhanced CT for nodule classification.

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Section: Resultsmentioning

confidence: 99%

Nodule Classification on Low-Dose Unenhanced CT and Standard-Dose Enhanced CT: Inter-Protocol Agreement and Analysis of Interchangeability

et al. 2018

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“…Heat maps were constructed to provide a visual representation of the overall readers' responses [38]. Interobserver agreement was measured using Krippendorff's a statistic.…”

Section: Discussionmentioning

confidence: 99%