Table 5.

Performance of asymptomatic surveillance scans by radiographic imaging modality within the LEAD cohort.

	Surveillance CT	Surveillance PET	Surveillance Other Imaging	TOTAL
Total Scans	402	160	22	584
Concerning for Relapse	29 (7%)	39 (24%)	0 (0%)	68b (12%)
Total True Positives	8 (2%)	13 (8%)	0 (0%)	21 (4%)
Sensitivity	88%	100%	0%	91%
Specificity	95%	83%	100%	92%
PPV	27%	33%	0%	31%
NPV	99.7%	100%	100%	99.6%

Abbreviations: Concerning for Relapse, radiographic imaging study concerning for relapse as initially read by a radiologist; Total True Positive, imaging study read as positive by radiologist and later confirmed by biopsy or further imaging studies; PET, positron-emission tomography; CT, computed tomography; Other Imaging, includes magnetic resonance imaging and mammography used as part of surveillance for FL; PPV, positive predictive value; NPV, negative predictive value.