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EJNMMI Physics

Table 2 Coincidence resolution time (FWHM)

From: Evaluation of the PETsys TOFPET2 ASIC in multi-channel coincidence experiments

 

KETEK

SensL

Hamamatsu

 

PA3325-WB-0808

Array-J-30020-64P-PCB

S14161-3050-HS-08

Threshold vth_t1

   

10

273.8±0.7 ps

265.2±0.6 ps

224.1±0.7 ps

20

271.4±0.7 ps

265.4±0.6 ps

221.2±0.7 ps

30

268.6±0.7 ps

263.7±0.6 ps

221.1±0.7 ps

40

266.1±0.6 ps

262.8±0.6 ps

219.9±0.7 ps

50

264.6±0.6 ps

262.4±0.6 ps

220.0±0.7 ps

Segmentation layer

   

BaSO4 (360 µm)

264.6±0.6 ps

262.4±0.6 ps

220.0±0.7 ps

BaSO4 (110 µm)

282.8±0.6 ps

306.5±0.6 ps

242.9±0.5 ps

ESR (67 µm, glued)

371.4±0.8 ps

463.4±0.8 ps

328.1±0.7 ps

Distance

   

18 mm

277.3±0.4 ps

-

-

38 mm

264.6±0.6 ps

262.4±0.6 ps

220.0±0.7 ps

58 mm

245.3±0.8 ps

253.3±0.8 ps

224.4±0.7 ps

Clinical (19 mm height)

   

ESR (155 µm, air-coupled)

317.3±1.9 ps

325.1±1.7 ps

247.5±2.4 ps

  1. Parameter study for multi-channel configurations featuring SiPMs by different vendors. Table reports the lowest CRT achieved in coincidence measurements of two times 64 channels with the corresponding settings and materials used. If not indicated differently, data were acquired at vth_t1=50, vth_t2=20, vth_e=15, with 360 µm BaSO4 for scintillator segmentation, a scintillator height of 12 mm, and at a distance of 38 mm. The overvoltage setting varies according to the parameter setting and SiPM type used. For the clinical configuration (19-mm high scintillator), only two times 16 channels were read out
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