Table 2.

Diagnostic accuracy of SPECT imaging: differentiation of tremulous disorders.

Test	Population	Sensitivity (%)	Specificity (%)
DaTSCAN TM 14	158 PD vs 27 ET	97	100
DaTSCAN TM 15	38 PD vs 38 Non-PD	87	-
123I-β-CIT SPECT 16	29 PD vs 32 ET	96.7	-
123I-β-CIT SPECT 17	35 patients	90	100

¹²³I-β-CIT = ¹²³I-2beta-carbomethoxy-3beta-(4-iodophenyl) tropane; PD = parkinsonian syndrome; ET = essential tremor; SPECT = single-photon emission computed tomography; DaTSCAN^TM = ¹²³I-Ioflupane;