The H/M ratio with the ME collimator, after application of the TEW or IDW methods, was close to the theoretical value in the phantom study. However, the corrected H/M ratios with the LEHR collimator provided comparable H/M ratios to the uncorrected ME data in phantom and clinical studies.

The H/M ratio using the semi-automated method showed high reproducibility in both early and delayed imaging.

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Background. Although heart-to-mediastinum (H/M) ratio in a planner image has been