■ ■ TOF-PET ImagingTOF-PET Imaging
t1
t2
d = c x t /2When t = 300 ps ➔ d = 4.5 cm
Timing resolution required for MPPC Timing resolution required for MPPC ≤ 200 ps
PET
TOF-PET
0
100
200
300
400
500
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Overvoltage (V)
FW
HM
( p
s )
■ ■ ResultsResults
High time resolution
Operating overvoltage range has expanded.Operating overvoltage range has expanded.
Pulse intensity: 10 photons
6x4 mm2, 50 m pitch: Standard MPPC: New MPPC
C
D
EC
E
D
Timing resolution has improved from 250 ps to Timing resolution has improved from 250 ps to 140 ps.140 ps.
250 ps250 ps
140 ps140 ps
■ ■ SummarySummary
Standard MPPC New MPPC
Dark Count 2.7 Mcps 1.7 Mcps
After Pulses > 100% 3%
PDE 38% 43%
Overvoltage Range
1.5 ~ 2.5 V 2 ~ 3.5 V
Gain 0.8 ~ 1.2 x 106 1.1 ~ 1.4 x 106
Timing Resolution
250ps*1 140ps
Overvoltage = 2.5 V6x4 mm2, 50 m pitch
*1) overvoltage = 2.0 V
■ Medical ・ PET MR-PET (Insensitive to magnetic field) TOF-PET(good timing resolution) DOI-PET(conpact)
■ Academic ・ High energy physics experiment ・ Elementary particle physics ・ Astronomy physics
■ Measurement ・ Distance measurement ・ DNA Sequencer ・ Diagnosis of blood ・ Fluorescence measurement
Applications
e+
e-
x
γ
γt1
t2 ( t2 - t1 ) ・ cX = 2
TOF-PET
DOI-PET