1. 核醫MP SPET影像處理與品管
Image Processing Parameters and Quality Control
for The Nuclear Myocardial Perfusion SPET
中華民國醫事放射師公會全國聯合會繼續教育講師：吳志毅
服務單位：長庚醫院北院區核子醫學科暨分子影像中心
46. QC of Polar map
▼ vessels
▼ walls ▼ 20 segments
▼ 17 segments
Volume Per Slice ＊Simpson Rule
(π ‧MaxRadius2 ) - (π ‧MinRadius2 ) ＊π= 3.14159
Stress Perfusion %
(StrCts._Avg/ StrMax Cts._Avg)‧100%
Rest Perfusion %
(RstCts._Avg/ RstMax Cts._Avg)‧100%
Washout %
(StrAvg. Cts - RstAvg. Cts) / Stress Avg. Cts‧100%
Redistribution %
(Perfusion%‧(100-Washout%)/(100-Ref.Washout%))-Perfusion%
＊If redistribution % is less than 0, then redistribution % = 0.
＊For Tc-99m agents studies, the ischemia score is calculated
instead of the redistribution.
47. QC of Polar map
For Tc-99m agents, the following correction factors apply. The following aspects
have to be considered: decay, administered dose, global washout of approximately
20% in 3 hours, rest uptake of the previous tracer dose.
B1 Factor
1 + 0.125 * (Stress time between injection and acquisition / 100) ‧e (0.00192 * Stress time before acquisition)
Rest Perfusion %
1 + 0.125 * (Rest time between injection and acquisition /100)‧e (0.00192 * Rest time before acquisition)
Compensate for Rest acquisition before the stress acquisition
Rst_H2 Factor = 1 - 0.125 * Total Time / 100；If H2 Factor is less than 0, then H2 Factor = 0
Str_H2 Factor = Rst_H2 Factor / e(0.00192 * Total Time) ‧ RstDose / StrDose
＊Total time = time between stress and rest + stress time between injection and acquisition (min)
Compensate for Stress acquisition before the rest acquisition
Rst_H2 Factor = 1 - 0.125 * Total Time / 100；If H2 Factor is less than 0, then H2 Factor = 0
Str_H2 Factor = Rst_H2 Factor / e(0.00192 * Total Time) ‧ RstDose / StrDose
＊Total time = time between stress and rest + stress time between injection and acquisition (min)
