Radiopharmaceuticals and PET Tracers
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Questions and Answers

What is the primary function of a radionuclide in a gamma camera?

  • To emit gamma rays to signal its location (correct)
  • To produce an image of the radioactive distribution
  • To convert gamma rays into optical light
  • To absorb gamma rays

    • What type of camera is used to detect gamma photons?

  • X-ray camera
  • Digital camera
  • Gamma camera (correct)
  • PET camera

    • What is the purpose of a collimator in a gamma camera?

  • To delineate the image from the patient (correct)
  • To focus gamma rays
  • To detect gamma photons
  • To absorb gamma rays

    • What is the function of a scintillation crystal in a gamma camera?

    <p>To convert gamma rays into optical light</p> Signup and view all the answers

    What is the name of the radionuclide that emits 141keV gamma rays?

    <p>99mTc</p> Signup and view all the answers

    What is the purpose of a light guide in a gamma camera?

    <p>To guide light from the scintillation crystal to the photomultiplier tube</p> Signup and view all the answers

    What is the purpose of automated synthesis device for PET tracers' production?

    <p>To prepare radiopharmaceuticals</p> Signup and view all the answers

    What is tested for to ensure radionuclide purity?

    <p>Contamination with 99Mo</p> Signup and view all the answers

    What is the purpose of radiopharmaceutical quality control?

    <p>To ensure the safety of the patient and staff</p> Signup and view all the answers

    What is used to test for chemical purity of a radiopharmaceutical?

    <p>Spot colour test</p> Signup and view all the answers

    What is the ideal function of a radiopharmaceutical in planar imaging?

    <p>To concentrate in the organ or tissues of interest</p> Signup and view all the answers

    What is the purpose of a dose calibrator?

    <p>To measure the activity of a radiopharmaceutical</p> Signup and view all the answers

    What is the range of thickness for scintillators used in medical imaging?

    <p>6 to 12.5 mm</p> Signup and view all the answers

    What is the purpose of the photomultiplier tube (PMT) in gamma detection?

    <p>To detect and convert optical photons into an electrical signal</p> Signup and view all the answers

    What happens when gamma photons interact with the scintillation crystal?

    <p>The energy is absorbed and converted to visible optical photons</p> Signup and view all the answers

    What is the peak wavelength of optical photons transmitted by the NaI scintillator?

    <p>415 nm</p> Signup and view all the answers

    What is the relationship between the electric current and detected optical photons in a PMT?

    <p>Directly proportional</p> Signup and view all the answers

    What is the purpose of the dynodes in a photomultiplier tube (PMT)?

    <p>To amplify the electric current</p> Signup and view all the answers

    What is the purpose of the focusing electrode in a photomultiplier tube?

    <p>To direct photoelectrons towards the first dynode</p> Signup and view all the answers

    What happens when primary electrons collide with the first dynode surface?

    <p>More electrons are liberated from the dynode surface</p> Signup and view all the answers

    What is the end result of the cascade procedure in a photomultiplier tube?

    <p>Electrons are collected at the anode</p> Signup and view all the answers

    What is the purpose of a gamma camera?

    <p>To detect gamma photons and form a gamma image</p> Signup and view all the answers

    What is the result of scattered gamma photons in a gamma image?

    <p>Increased image noise</p> Signup and view all the answers

    What is the formation of a gamma image based on?

    <p>A true mapping of the targeted region</p> Signup and view all the answers

    What is the purpose of using a dual- or triple-headed camera in SPECT?

    <p>To halve image acquisition time or improve sensitivity</p> Signup and view all the answers

    Why is an elliptical orbit sometimes used in SPECT?

    <p>To minimize the gap between the collimator and the patient</p> Signup and view all the answers

    What is the benefit of using dedicated equipment with multiple gamma cameras in SPECT?

    <p>Improved sensitivity</p> Signup and view all the answers

    How can SPECT studies be presented?

    <p>Either as a series of slices or as a three-dimensional display</p> Signup and view all the answers

    What is the advantage of rotating the 3-D display of SPECT studies on the computer screen?

    <p>Reducing image noise</p> Signup and view all the answers

    What is one of the major uses of SPECT?

    <p>Thallium studies of myocardial infarctions and ischaemia</p> Signup and view all the answers

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