An Adaptive Thresholding Method for BTV Estimation Incorporating PET Reconstruction Parameters: A Multicenter Study of the Robustness and the Reliability

Table 1

PET/CT scanners: main technical characteristics and physical performances.

	Discovery ST; (general electric); S1-2	Discovery STE; (general electric); S3	Discovery 600; (general electric); S4-5	Discovery 690; (general electric); S6	Biograph16 Hi-REZ; (Siemens); S7	Biograph 6 True V; (Siemens); S8	Gemini XL; (Philips); S9	Gemini TF; (Philips); S10
Detector ring diameter (cm)	88.6	88.6	80.1	80.1	83.0	83.0	88.5	90.3
Detector material	BGO	BGO	BGO	LYSO	LSO	LSO	GSO	LYSO
Acquisition mode	2D/3D	2D/3D	3D	3D	3D	3D	3D	3D
Number of individual crystals	10.080	13.440	12.288	13824	24.336	32448	17.864	28.336
Number of crystal/ring	420	560	512	576	624	624	616	NA
Number of image planes	47	47	47	47	81	109	90	90
Crystal size (mm^3)
Patient port diameter (cm)	70	70	70	70	70	70	70	71.7
Axial field of view (cm)	15.7	15.7	15.7	15.7	16.2	21.8	18.0	18.0
Transaxial filed view (cm)	70	70	70	70	58.5	60.4	57.6	57.6
Axial sampling interval (mm)	3.27	3.27	3.27	3.27	2.0	2.0	2.0	2.0
Coincidence window width (ns)	11.7	9.3	9.0	4.9	4.5	4.5	7.5	6.0
Lower energy threshold (keV)	375	425	425	425	425	425	410	440
Physical performances
Transverse resolution
FWHM (mm) at 1 cm	6.29	5.1	4.9	4.70	4.61	4.1	5.2	4.8
FWHM (mm) at 10 cm	6.82	5.7	5.6	5.06	5.34	4.8	5.8	5.0
Axial resolution
FWHM (mm) at 1 cm	5.68	5.2	5.6	4.74	5.10	4.7	5.8	4.8
FWHM (mm) at 10 cm	6.05	5.9	6.4	5.55	5.93	5.7	6.6	5.2
System sensitivity (cps/KBq)	8.99	8.8	9.6	7.5	4.87	8.0	8.0	6.6
Scatter fraction (%)	45	34	36.6	37	34.1	32.7	35	27