X-ray CT high-density artefact suppression in cryosurgery.

Area of Science:

• Medical Imaging
• Surgical Technology
• Image Processing

Background:

• X-ray computed tomography (CT) offers 3D visualization for cryosurgery guidance.
• CT thermal calibration is crucial but challenged by cryoprobe-induced artifacts.
• High-density streak artifacts compromise image quality and thermal calibration.

Purpose of the Study:

• To develop and evaluate a novel subtraction technique for suppressing cryoprobe artifacts in X-ray CT images.
• To improve the visualization of cryoprobes and iceballs during cryosurgery, particularly in challenging anatomical regions.

Main Methods:

• A subtraction technique was developed using X-ray CT projection profiles.
• The method involves subtracting probe profiles to isolate the background, followed by reconstruction and reinsertion of probe data.
• The technique was tested using phantoms, including a pelvic phantom with a human skeleton.

Main Results:

• The subtraction technique successfully suppressed high-density streak artifacts caused by cryoprobes.
• Visualization of cryoprobe positions and dimensions was well-preserved after artifact suppression.
• The method demonstrated effectiveness in bone-abundant regions like the pelvis.

Conclusions:

• The proposed subtraction technique significantly enhances X-ray CT imaging for cryosurgery guidance.
• This method improves image quality and reliability, especially in anatomically challenging areas.
• The technique facilitates better assessment of cryosurgery procedures through artifact-free imaging.