The peanut orbit: a modified elliptical orbit for single-photon emission computed tomography imaging

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiological Physics

Background:

• Conventional single-photon emission computed tomography (SPECT) systems using elliptical orbits risk collimator-patient contact due to large camera dimensions and perpendicularity requirements.
• Maintaining optimal patient-detector distance during SPECT imaging is crucial for image quality and safety.

Purpose of the Study:

• To develop and evaluate an improved body contour orbit for SPECT imaging to prevent patient-detector contact.
• To enhance the safety and efficacy of SPECT procedures through advanced orbital path planning.

Main Methods:

• Development of simulation software featuring spatially calibrated graphic representation of the SPECT imaging system, patient, and camera orbit.
• Computer simulations to analyze and propose a modified elliptical orbit, termed the 'peanut orbit'.
• Implementation and testing of the peanut orbit algorithms on dual-camera rotating ring and single-camera multimotion stand SPECT systems.

Main Results:

• The proposed peanut orbit successfully minimizes collimator-patient distance while compensating for camera motion, preventing potential patient contact.
• Modified algorithms were successfully installed and operated on clinical SPECT systems.
• Software adjustments were implemented for ring-based gantry systems to correct for translational shifts in the field of view.

Conclusions:

• The peanut orbit represents a significant improvement for body contour imaging in rotational SPECT, enhancing patient safety.
• This novel approach offers a safer alternative to conventional elliptical orbits in SPECT examinations.
• The developed simulation tools and peanut orbit algorithms are effective for clinical application in SPECT imaging.