FDG concentration 2.1 kBq/mL 　 　 　 　 　 　
  Partial-scan reconstruc
-tion 		　 Full scan reconstruc
-tion		 　 Average CT 　
Sphere diameter :
17-mm		 Mean ±SD Range Mean ±SD Range Mean ±SD Range
RC 0.66±0.03 0.63,0.71 0.51±0.01 0.49,0.53 0.54±0.01 0.52,0.56
Volume error (%) 4.3±12.4 -14.4, 20.2 -1.3±5.6 -10.5,
6.6		 -4.1±6.1 -11.3,
4.3
Sphere diameter :
22-mm		 　 　 　 　 　 　
RC 0.71±0.04 0.63,0.76 0.56±0.02 0.53,0.59 0.59±0.01 0.57,0.61
Volume error (%) 1.8±6.4 -7.7,
10.2		 2.2±4.6 -5.0,7.5 -2.1±8.1 -17.6, 0.4
Sphere diameter :
28-mm		 　 　 　 　 　 　
RC 0.81±0.05 0.80,0.86 0.60±0.02 0.60,0.61 0.64±0.01 0.62,0.67
Volume error (%) 1.2±7.6 -10.5, 10.7 -5.5±4.4 -11.0,
2.1		 -4.7±4.1 -10.4,
0.8
Sphere diameter :
37-mm		 　 　 　 　 　 　
RC 0.94±0.04 0.90,1.00 0.64±0.03 0.61,0.67 0.67±0.01 0.66,0.70
Volume error (%) 3.2±5.5 -5.9,
10.1		 -2.1±3.5 -7.6,3.1 -1.4±3.7 -7.8,
2.3
FDG concentration 4.2 kBq/mL 　 　 　 　 　 　
　 Partial-scan reconstruc
-tion 		　 Full scan reconstruc
-tion		 　 Average CT 　
Sphere diameter:
17-mm		 Mean ±SD Range Mean ±SD Range Mean ±SD Range
RC 0.86±0.02 0.83, 0.90 0.67±0.02 0.63, 0.69 0.52±0.01 0.51,0.54
Volume error (%) 2.3±7.1 -10.5, 12.5 11.7±9.8 -3.8, 26.5 -6.6±4.2 -14.4,
-5.1
Sphere diameter :
22-mm		 　 　 　 　 　 　
RC 0.94±0.02 0.92, 0.97 0.69±0.01 0.67, 0.71 0.54±0.01 0.52,0.55
Volume error (%) 4.9±5.8 -5.0,
12.0		 10.4±16.7 -16.2,
32.7		 -2.1±4.9 -8.1, 4.3
Sphere diameter :
28mm 		　 　 　 　 　 　
RC 1.00±0.02 0.97, 1.02 0.75±0.02 0.73, 0.77 0.58±0.01 0.56,0.59
Volume error (%) -0.2±5.3 -8.8, 7.2 8.0±9.0 -4.0, 19.5 -7.5±4.5 -15.2,
-2.2
　 　 　 　 　 　 　
Sphere diameter :
37-mm 		　 　 　 　 　 　
RC 1.06±0.03 1.01, 1.11 0.83±0.02 0.81,0.86 0.61±0.01 0.60, 0.63
Volume error (%) 1.2±3.8 -5.0, 6.3 8.2±14.6 -10.1, 31.0 -3.8±3.9 -9.7, 0.7
* RC=Ci/Cr×100, where Ci and Cr represent the maximal concentration of radioactivity in the volume of interest and in the fixed 37 mm sphere without motion, respectively. Maximum radioactivity concentration of the 37-mm fixed sphere served as reference for each parameter
Table 3: Comparison of recovery coefficients (RC) and calculated volume errors of four-dimensional positron emission tomography (4DPET) images with different computed tomography (CT) attenuation correction.