• Object ID: 00000018WIA3065D770GYZ
  • Topic ID: id_40025213 Version: 1.5
  • Date: Aug 17, 2022 11:51:13 AM

Radial prescription

Before you begin

The scan prescription must be one of the following 2D PSDs:
  • FSE
  • FRFSE
  • 2D GRE
  • SSFSE
  • SSFSE-IR
  • FastCard
  • FastCINE
  • FIESTA

About this task

Use these step to prescribe multiple slices acquired around a central axis in the same series. This type of prescription can be useful for imaging, but not limited to: knees, MRCP (Magnetic Resonance Cholangiopancreatographies), myelograms, and hearts.

Step-by-step instructions

  1. From the Graphic Rx toolbar, click the Radial icon.

    Result

    The Radial menu opens.
  2. In # of Slices, enter a number value to specify the desired number of slices.
    Figure 1. Radial menu
    • Be sure to do this before you press click to deposit the locations.
    • If slices are deposited and then the number of slices is changed, the system views these additional slices as a second group and therefore the system acquires two separate groups of images and doubles the scan time.
    • The maximum allowable is 36.
    • Keep the number of slices at the default of one if you do not desire to perform a radial prescription.
  3. In Partial Spacing, enter a value to specify the degrees between each slice to control the angle between slice locations.
    • Enter 0 for a wagon wheel graphic prescription with the angle between each slice determined by the value entered in # of Slices.
      Figure 2. Wagon wheel prescription, partial spacing = 0.1
      Table 1. Image legend
      NumberDescription
      1Rotation handle
      2Move handle
    • Enter a value greater than zero for a cat whiskers prescription.
      Figure 3. Cat whiskers prescription, partial spacing = 5
      Table 2. Image legend
      NumberDescription
      1Rotation handle
      2Move handle
  4. Set the number of Locs or Acqs Before Pause.
    • Enter 0 for all the slices to have the same angle. This allows you to scan all slices in one breath hold. For multiple shorter breath holds, type in any number to break up the group.
    • Enter 0 or 1 for a radial prescription. If you enter 1, the system pauses after each slice and you need to click Scan to acquire each slice. If you select 0, cross-talk can occur where the slices intersect.
  5. Optional: Select Clockwise or Counter Clockwise to change the direction of the image acquisition.

    Result

    The system defaults to clockwise.