Nuclear Medicine Physics Jerry Allison, Ph.D. Department of Radiology Medical College of Georgia Image Artifacts in Nuclear Medicine Part B

2 Attenuation by diaphragm  an apparent defect in the inferior wall

3 Myocardial perfusion studies Attenuation compensated vs Non-compensated

4 Cerebral perfusion studies Tc-HMPAO or Tc-ECD Non compensated Compensated

5 Misalignment in SPECT/CT

6

7 Inaccuracy in attenuation compensation

8

Septal Penetration Thyroid scan on a patient imaged with a low energy collimator.

Septal Penetration These 111 In images were obtained simultaneously with a dual head camera, and the collimator for the posterior head had not been changed to a medium energy collimator. Therefore, there is significant septal penetration (typical star pattern). 2015Nuclear Medicine Physics for Radiology ResidentsSameer Tipnis, PhD, DABR

11 A telemetry monitor on patient's chest

PET/CT issues  Metallic artifact  Truncated CT  CT contrast  Respiration misalignment  Motion  Brown fat  Scar 12

13 Attenuation correction in PET  High uptake in lungs  Low uptake in others  High uptake in skin w/o comp

2014 PET image of the ACR phantom mm

2014 SPECT image of the ACR phantom as mm 15.9 mm 31.8 mm Sphere diameters: 9.5, 12.7, 15.9, 19.1, 25.4, and 31.8 mm

16 CT PET comp PET w/o Metallic implant

17 PET comp PET w/o Metallic implant CT

18 CT PET comp Truncated CT

19 SUV=1.96 Corrected SUV=7.44 Truncated CT

20 CT PET comp PET w/o CT contrast

21 CT PET comp CT contrast

22 PET comp Respiration misalignment in PET/CT

23 PET comp PET w/o Respiration misalignment in PET/CT

24 Head motion in PET Corrected

25 Head motion  increased uptake in right face as compared with the left side

26 Brown fat uptake of 18 F-FDG  keep patient warm

27 Question PET comp PET w/o Pace maker CT

28 Question PET comp PET w/o CT contrast CT

29 Question Corrected SUV=0.79 SUV=0.32 CT truncation

30 Question PET comp PET w/o Metallic implant CT

31 Question Scar uptake of 18 F-FDG PET comp

Time of flight PET image of a big patient Why better resolution? Less noise  lighter filtering  more resolution preserved (electronic collimation)