Nuclide Imaging: Planar Scintigraphy, SPECT, PET - Polytechnic ...

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Photomultiplier Tubes• Each tube converts a light signal to an electrical signaland amplifies the signalEL5823 Nuclear Imaging Yao Wang, Polytechnic U., Brooklyn 16
Inside a Photomultiplier Tube10^6-10^8 electronsreach anode for eachelectron liberated fromthe cathodeIncreasing in voltage,Repeatedly generates moreelectrons, 10-14 stepsDynode: positivelychargedFor each electronreaching a dynode, 3-4electrons are releasedFor every 7-10photons incident uponthe photocathode, anelectron is releasedOutputs a current pulse each time a gamma photon hits the scintillation crystal.This current pulse is then converted to a voltage pulse through a preamplifier circuit.EL5823 Nuclear Imaging Yao Wang, Polytechnic U., Brooklyn 17
Page 1 and 2: Nuclide Imaging: PlanarScintigraphy
Page 3 and 4: What is Nuclear Medicine• Also kn
Page 5 and 6: What is Radioactivity?EL5823 Nuclea
Page 7 and 8: Gamma Decay (Isometric Transition)
Page 9 and 10: Radioactive Decay Law• N(t): the
Page 11 and 12: Overview of Imaging Modalities• P
Page 13 and 14: Anger Scintillation CameraCompare t
Page 15: • Scintillation crystal:Scintilla
Page 19 and 20: Pulse Height CalculationEL5823 Nucl
Page 21 and 22: Acquisition ModesEL5823 Nuclear Ima
Page 23 and 24: Single Frame ModeThe value in each
Page 25 and 26: Multiple Gated AcquisitionEL5823 Nu
Page 27 and 28: Imaging EquationEL5823 Nuclear Imag
Page 29 and 30: Examples• Example 1: Imaging of a
Page 31 and 32: SPECT Instrumentation• Similar to
Page 33 and 34: Imaging Equation: θ=0(z,l)RReplace
Page 35 and 36: General Case: Imaging EquationEL582
Page 37 and 38: Correction for Attenuation Factor
Page 39 and 40: SPECT applications• Brain:- Perfu
Page 41 and 42: Annihilation Coincidence Detection
Page 43 and 44: Coincidence TimingEL5823 Nuclear Im
Page 45 and 46: Multiple Ring DetectorEL5823 Nuclea
Page 47 and 48: A Typical PET ScannerEL5823 Nuclear
Page 49 and 50: Imaging EquationNNN+−c( s )( s )(
Page 51 and 52: Reconstruction from Corrected Sinog
Page 53 and 54: PET resolution compared to MRIPET
Page 55 and 56: PET applications• Brain:- Tumor d
Page 57 and 58: Image Quality Consideration• We w
Page 59 and 60: Collimator ResolutionRc(z)2* Rc(z)
Page 61 and 62: Intrinsic ResolutionE) dz’ }EL582
Page 63 and 64: Detector EfficiencyEL5823 Nuclear I
Page 65 and 66: Summary• Three major imaging moda
Page 67:
Homework• Reading:- Prince and Li
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Nuclide Imaging: Planar Scintigraphy, SPECT, PET - Polytechnic ...

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