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A port film marker.

D Jones1, J Armstrong, M D Hafermann

  • 1Northwest Medical Physics Center, Lynnwood, WA 98036.

International Journal of Radiation Oncology, Biology, Physics
|July 1, 1989
PubMed
Summary
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A novel device with brass strips creates a crosshair image in radiation beams for accurate scale and orientation. This eliminates the need for anatomical markers, simplifying imaging procedures.

Area of Science:

  • Medical Imaging
  • Radiation Therapy Physics

Background:

  • Accurate patient positioning and image orientation are critical in radiation therapy.
  • Traditional methods often rely on anatomical markers, which can be time-consuming and prone to error.

Purpose of the Study:

  • To introduce a new device for precise centering and orientation in radiation imaging.
  • To evaluate the device's ability to provide scale for magnification determination.
  • To assess the device's potential to replace conventional anatomical markers.

Main Methods:

  • A device composed of brass strips embedded in a plastic plate was designed.
  • The device was tested within a radiation beam.
  • Image analysis focused on the generated crosshair, scale projection, and orientation marker.

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Main Results:

  • The device consistently produced a centered crosshair image in the radiation field.
  • Defined intervals on the brass strips projected a scale onto the film, enabling magnification factor determination.
  • A dedicated marker in the lower right quadrant ensured rapid and unambiguous film orientation.

Conclusions:

  • The described device offers a reliable method for centering and orientation in radiation imaging.
  • Its integrated scale facilitates accurate magnification assessment.
  • The device's orientation capability renders anatomical markers redundant, streamlining the imaging process.