• Object ID: 00000018WIA30614970GYZ
  • Topic ID: id_40021398 Version: 1.4
  • Date: Jun 21, 2022 4:22:55 PM

oZTEo (MR bone)

oZTEo is not available on 32-channel systems.

About this task

oZTEo (MR Bone) is a type-in, 3D, Gradient Echo, Fast SPGR sequence that uses a ZTE (zero TE) Acquisition for 3D k-space data acquired in radial trajectories. It creates images with bright bone signal, flat soft tissue, and an inverted grayscale.

oZTEo (MR Bone) is useful for post-processing with MR General Review for better visualization of bone surfaces.

Figure 1. Example of oZTEo images

Use these steps to acquire bright bone images and flat soft tissue images.

Step-by-step instructions

  1. From the Workflow Manager, click Add Task > Add Sequence.
  2. From the Protocol screen, select an oZTEo (MR Bone) protocol from your site or GE library.
    • If you cannot locate an oZTEo (MR Bone) protocol in either library, select a series to modify, then from the Imaging Options/PSD screen select:
      1. Imaging Mode menu: 3D.
      2. Family list: Gradient Echo.
      3. Pulse list: Fast SPGR.
      4. PSD Name field: type in ozteo
        • the name ozteo is a combination of ZTE (zero TE) and osteo.
      5. Click Accept.
  3. Make protocol adjustments, as needed.
    Figure 2. Detail screen
    • Select SCENIC as the Intensity Correction, an oZTEo requirement.
    • oZTEo is incompatible with coils that do not support SCENIC.
    • Select a noise reduction Intensity Filter (for example G).
    • Optional: select Save Original option so that two DICOM series are reconstructed:
      • DICOM series with SCENIC Intensity Correction, Intensity Filter with G and an inverted contrast (bone is bright).
      • Original DICOM series is without SCENIC Intensity Correction, without Intensity Filter G, but has inverted contrast (bone is bright).
    • oZTEo can be acquired in any plane: axial, sagittal, coronal, oblique.
    • Select a flip angle of 1 or 2.
    • Select a Bandwidth between ±50 to ±100 kHz.
      • A larger BW leads to a more uniform or flat soft tissue contrast.
    • From the scan parameter screen, review the Pixel Size display.
      • The Frequency and Frequency FOV affect the Pixel Size value. Change either the Frequency or Frequency FOV value and the Pixel Size display updates.
      • Note: that the Slice Thickness value must not be smaller than the Pixel Size.
      • An approximately isotropic pixel resolution is recommended to aid 3-plane reformatting. Prescribe Graphic Rx as appropriate for your needs.
  4. If desired, Add post-process task. Compatible post-process tasks include:
    • Image Enhancement Filters. Note that for oZTEo, E filter should be used prospectively in the prescription, not as post-processing.
    • Multi Planar Reconstruction
    • Maximum Intensity Projection
  5. When the prescription is finished, click Save Rx and Scan.