Attenuation correction in hybrid positron emission tomography

Area of Science:

• Nuclear Medicine
• Medical Imaging
• Radiochemistry

Background:

• Attenuation significantly impacts positron emission tomography (PET) imaging compared to single-photon imaging.
• Dedicated PET scanners now offer attenuation correction capabilities.
• Attenuation correction is essential for accurate radioactivity distribution and quantitation in PET.

Purpose of the Study:

• To highlight the importance and novelty of attenuation correction in hybrid PET systems.
• To discuss the advancements in attenuation correction methods for hybrid PET scanners.
• To emphasize the benefits of attenuation correction for image interpretation and quantitation.

Main Methods:

• Review of existing attenuation correction techniques for PET.
• Evaluation of radioactive source-based and x-ray-based attenuation mapping systems.
• Assessment of the impact of attenuation correction on image realism and quantitation.

Main Results:

• Attenuation correction is more critical in PET than single-photon imaging.
• Hybrid PET systems are increasingly incorporating attenuation correction.
• Both radioactive source and x-ray-based methods provide effective attenuation maps, with x-ray offering additional anatomical detail.

Conclusions:

• Attenuation correction is vital for accurate PET quantitation and realistic radioactivity distribution, particularly in hybrid systems.
• The development of effective attenuation correction methods has rapidly followed the expansion of hybrid PET technology.
• X-ray-based attenuation correction in hybrid systems enhances image interpretation by providing anatomical context.