Dosimetry and Comparison between Different CT Protocols (Low Dose, Ultralow Dose, and Conventional CT) for Lung Nodules’ Detection in a Phantom

Table 4

Comparison of nodule detection rates between pairs of protocols (kappa values).

	Protocol 1	Protocol 2	Protocol 3	Protocol 4	Protocol 5
Protocol 1	—	0.617	0.766	0.605	0.398
Protocol 2	0.617	—	0.718	0.688	0.385
Protocol 3	0.766	0.718	—	0.694	0.494
Protocol 4	0.605	0.688	0.694	—	0.502
Protocol 5	0.398	0.385	0.494	0.502	—