Fig. 2

Bubble plot of study-individual appropriateness and number of reviewed examinations. The Bubble plot shows a matrix of study-individual appropriateness results (y-axis) and the number of reviewed examinations (x-axis). The age-stratified (adult, children) results were separately presented according to the aggregated body regions chest/abdomen/pelvis, chest/breast, general musculoskeletal (MSK)/extremities, head/neck, heart/vessels, other/miscellaneous, spine and whole body. Interventional studies are highlighted with black circles. Four studies reviewing the appropriateness of imaging other/miscellaneous body regions (CT + MRI) [64], heart/vessels CT [86], chest/breast CT [65] and whole body CT [89] were not included into the bubble plot due to missing information on the number of reviewed images. 1: Identical study results [100] of children and adult CT lead to a total overlap of bubbles in head/neck imaging. 2: Similar study results of adult MRI [93, 101] and adult CT [75] lead to a partial overlap of bubbles in head/neck imaging. CT Computed tomography. MRI Magnetic resonance imaging. MSK Musculoskeletal. US Ultrasound. XR Radiography