Oral Medicine and Radiology Imaging
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Questions and Answers

What is the purpose of normalizing CT numbers to the attenuation value of water?

  • To reduce radiation exposure
  • To make the CT numbers easier to read
  • To highlight air in the image
  • To allow comparison of tissue densities (correct)

    • What term is used to represent tissue density in a CT image?

  • CT numbers (correct)
  • Voxels
  • Pixels
  • C-arm

    • What is the CT number of air on the Hounsfield unit (HU) scale?

  • Zero
  • -500
  • -1000 (correct)
  • 1000

    • What is the basic principle behind Cone Beam Computed Tomography (CBCT) imaging?

    <p>Directing a collimated cone x-ray through the region of interest</p> Signup and view all the answers

    Which of the following is an indication for Maxillofacial Multidetector Computed Tomography?

    <p>Developmental anomalies of craniofacial skeleton</p> Signup and view all the answers

    What do CT numbers represent in a CT image?

    <p>Tissue density</p> Signup and view all the answers

    What is the purpose of capturing multiple sequential planar projection images during rotation?

    <p>To produce basis images for interpretation</p> Signup and view all the answers

    How are basis images different from cephalometric radiographic images?

    <p>Each basis image is slightly offset from the next, unlike cephalometric images</p> Signup and view all the answers

    What determines the number of images that constitute the projection data in CBCT imaging?

    <p>The completeness of the trajectory arc and rotation speed</p> Signup and view all the answers

    Which component of image production involves stabilizing the patient and setting the X-ray generator parameters?

    <p>X-ray generation (Acquisition)</p> Signup and view all the answers

    In CBCT imaging, what remains constant for the X-ray source during image acquisition?

    <p>Focal spot size</p> Signup and view all the answers

    What role does the detector frame rate play in determining the number of images in CBCT projection data?

    <p>Affecting the completeness of the trajectory arc</p> Signup and view all the answers

    What is one of the advantages of CBCT compared to CT?

    <p>Reduced size &amp; cost</p> Signup and view all the answers

    Which feature of CBCT allows for real-time dimensional assessment and measurements?

    <p>Interactive analysis</p> Signup and view all the answers

    What is one of the disadvantages of CBCT imaging mentioned in the text?

    <p>Image noise/artifacts</p> Signup and view all the answers

    Which aspect of CBCT allows for unique display modes in maxillofacial imaging?

    <p>Interactive display modes</p> Signup and view all the answers

    What is one difference between CBCT and medical CT?

    <p>CBCT offers variable FOV</p> Signup and view all the answers

    Which publication compares maxillofacial CBCT and medical CT?

    <p>Atlas Oral Maxillofac Surg Clin North Am.</p> Signup and view all the answers

    What is the basic principle of Computed Tomography (CT) imaging technique?

    <p>A collimated x-ray source and a detector rotate around the patient.</p> Signup and view all the answers

    What advantage of CT imaging eliminates the superimposition of images?

    <p>Detailed visualization of structures outside the area of interest</p> Signup and view all the answers

    Which generation of CT scanner uses a solitary x-ray pencil like beam and a solitary detector?

    <p>First Generation CT</p> Signup and view all the answers

    What is the characteristic of the fan beam in Second Generation CT scanners?

    <p>It rotates around the patient in small increments.</p> Signup and view all the answers

    Which feature makes CT a painless imaging technique?

    <p>Non-invasive nature</p> Signup and view all the answers

    What does the detector in CT scanners record during imaging?

    <p>Photon attenuation</p> Signup and view all the answers

    What is the role of flat panel detectors (FPDs) in X-ray detection for CBCT imaging?

    <p>Serving as an alternative to image intensifier tube/charge-coupled device (II/CCD) combination</p> Signup and view all the answers

    What does the grayscale ability of CBCT imaging depend on?

    <p>The detector's capability to show accurate contrast differences</p> Signup and view all the answers

    How many shades of gray can current CBCT machines identify with their 12 bit detectors?

    <p>4096 shades of gray</p> Signup and view all the answers

    What occurs during the secondary (multiplanar) reconstruction stage in CBCT imaging?

    <p>Creation of sagittal, coronal, or axial images</p> Signup and view all the answers

    What is the significance of voxel size in CBCT imaging?

    <p>It is equal in all three dimensions</p> Signup and view all the answers

    In CBCT imaging, what is the process involved in dividing the volume into tiny cubes or voxels?

    <p>Primary reconstruction</p> Signup and view all the answers

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