Great visibility

Also on MRI, thanks to unique material

Thin marker in unique material

The marker is only 0.28 or 0.4 mm thick, which improves the surface-to-volume ratio.

The marker is made of an alloy of gold and 0.5% iron for improved MR visibility (pat. pend.).

Benefits

  • Reduce CT-artifacts
  • Easily register CT and MR images
  • Clearly visible on kV and ultrasound
  • Ideal for proton therapy

Reduce CT artifacts

The small Gold Anchor markers cause limited CT-artifacts.

 fiducial marker and prostate on CT image

Easily register CT and MR images

T1-weighted MR sequence
Ball shaped Gold Anchors are clearly visible on ordinary T1-weighted MR sequences.
T2-weighted MR sequence
Ball shaped Gold Anchors can also typically be identified on T2-weighted MR sequences. You can thereby detect and adjust for any potential organ movement between MR sequences.

Minimize artifacts and dose pertubation

T2-weighted MR sequence
To further minimize CT artifacts the Gold Anchor markers can be implanted with a line shape. This is also ideal for proton therapy since it minimizes dose perturbation.

Image courtesy of the Department of Oncology and Radiotherapy, Turku University Hospital.

T2-weighted MR sequence
Line shaped 0.4 mm diameter markers can be visualized with Balanced Fast Field Echo (bFFE) MR sequences.

Image courtesy of the Department of Oncology and Radiotherapy, Turku University Hospital.

Clearly visible on kV

Gold Anchor has been designed for use with kV imaging. The kV x-ray is heavily attenuated whenever it passes through a material of high density, such as gold. A high kV, approximately 130 kV, should be used to fade away the skeleton structures.

kV image

Visible on MVCT

The 0.4×20 mm Gold Anchor markers are visible on MVCT if they have been implanted with a ball shape.

MVCT image
MVCT registered to CT images to determine need for repositioning. The MVCT images have been captured with a Siemens ARTISTE system at the Nu-Med Radiotherapy Clinic in Elblag, Poland.
MVCT registered to CT

Gold Anchor enables easy fusion of CT and MR images

Two Gold Anchors implanted in prostate. In the images below, the CT and MR images are matched on two markers, one in each lobe.

Liver CT

patient 1

Images courtesy of Dr. Hiroshi Doi, Mr. Shogo Harui and Dr. Yoshio Hishikawa at the Meiwa Cancer Clinic, Japan

Liver MRI

patient 2

Images courtesy of Dr. Hiroshi Doi, Mr. Shogo Harui and Dr. Yoshio Hishikawa at the Meiwa Cancer Clinic, Japan