Attenuation Correction Using Template PET Registration for Brain PET: A Proof-of-Concept Study.

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiological Physics

Background:

• Dedicated brain PET systems require accurate attenuation correction for quantitative imaging.
• The NeuroLF system, a novel brain PET scanner, lacks integrated CT or MR capabilities.
• Accurate attenuation maps are crucial for correcting photon attenuation in PET scans.

Purpose of the Study:

• To demonstrate a template-based attenuation correction method for the NeuroLF brain PET system.
• To evaluate the image quality of attenuation correction using template registration compared to CT-based methods.
• To assess the feasibility of this method for [18F]FDG PET brain scans.

Main Methods:

• Utilized a low-resolution prototype of the NeuroLF system, named BPET.
• Performed affine registration of a template PET scan to the uncorrected emission image.
• Applied the derived transformation to a template attenuation map for correction.
• Compared results against a reference whole-body PET/CT system.

Main Results:

• The template registration method achieved an average correlation of 0.893 with the reference scan.
• CT-based attenuation correction yielded a comparable average correlation of 0.908.
• The proposed method demonstrated similar image quality to CT-derived attenuation maps.

Conclusions:

• Attenuation correction using template registration is a viable alternative to patient CT for brain PET.
• This method offers comparable image quality and is suitable for the NeuroLF system.
• It presents a valuable option for patients undergoing brain PET imaging, especially when CT is unavailable or contraindicated.