Nuclear Medicine GAMMA CAMERA- weekly and daily QA

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Information about Nuclear Medicine GAMMA CAMERA- weekly and daily QA
Science-Technology

Published on July 13, 2008

Author: muralinz

Source: authorstream.com

QUALITY CONTROL TESTING OF A SCINTILLATION CAMERADAILY AND WEEKLY : QUALITY CONTROL TESTING OF A SCINTILLATION CAMERADAILY AND WEEKLY Slide 2: Test1 Set and check energy windows or peaking Frequency – Daily and before imaging different radionuclide Point source of radionuclide to be imaged Slide 3: Properly Adjusted 15 % window Improperly adjusted 20 % window Properly Adjusted 20 % window Slide 4: Window set to high side of photo peak Window symmetrically positioned Window set to low side of photpeak Slide 5: A-Photopeak is caused by the total absorption of the 140 kev gamma rays B. Escape peak –K shell xrays C. Lead peak Slide 6: Test 2 Extrinsic or intrinsic low count uniformity images of all camera heads Frequency – Daily 2- 6 million counts Slide 7: Improper flood phantom preparation Adherence of RPC particles to inner surface Particulate formation within the liquid Incomplete mixing of radionuclide Air Bubble simulating a PMT malfunction Slide 8: Ant view –liver picture 2 photopenic areas (arrows)-Suspected of being artifactual. Planar Extrinsic flood image demonstrating collimator damage as cause Slide 9: Subtle non uniformities Increasing non uniformites with time Uniformity corrected flood INTRINSIC FLOOD Slide 10: Test 3 Spatial (Distortion) Linearity and Resolution check with bar pattern 1 to 2 weeks Slide 11: Non uniformity and loss of resolution Occur when activity is great Resolution returns when activity reduced to proper level Slide 12: Intrinsic spatial resolution- 4 quadrant Bar Phantom -2.0,2.5,3.0,3.5mm wide lead bars. Slide 13: Test 4 Centre rotation 1 or 2 weeks Point source as recommended by manufacturer Slide 15: Reconstructed transaxial images can show the point sources appearing too large or even having a cold center if the centre of the rotation is misaligned Pictures shows rapid deterioration of resolution and introduction of circular artifacts Slide 16: Nuclear Med Technology and Techniques-Bernier Physics in Nuclear Medicine-James N sorenson Quality control of NM imaging devices-P.S.Soni Essential physics of medical imaging-Jerrold T Bushberg References: Slide 17: END

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