PET/CT in Gastrointestinal Cancer: Methodological Aspects

Area of Science:

• Radiology and Nuclear Medicine
• Oncology
• Medical Imaging

Background:

• Positron Emission Tomography/Computed Tomography (PET/CT) combines functional and anatomical imaging.
• CT data in PET/CT are crucial for attenuation correction and lesion localization.
• Optimizing CT protocols is essential for enhancing diagnostic accuracy.

Purpose of the Study:

• To evaluate the impact of oral and intravenous contrast agents on PET/CT data quality.
• To assess the effect of contrast-enhanced CT on the diagnostic performance of PET/CT.
• To determine the utility of optimized CT protocols in gastrointestinal cancer staging.

Main Methods:

• Standardized PET/CT imaging protocols were employed.
• Oral and intravenous contrast agents were administered for CT acquisition.
• PET and CT data were analyzed qualitatively and quantitatively.
• Diagnostic performance was evaluated, particularly for recurrent colorectal cancer.

Main Results:

• No significant qualitative or quantitative differences were observed in PET data when using oral versus intravenous contrast agents.
• The administration of intravenous contrast agents significantly enhanced the diagnostic performance of integrated PET/CT.
• PET/CT demonstrated high utility in identifying recurrent colorectal cancer.

Conclusions:

• CT protocol optimization with contrast agents does not negatively impact PET data.
• Intravenous contrast administration is beneficial for improving PET/CT diagnostic accuracy in gastrointestinal malignancies.
• PET/CT remains a valuable tool for the detection and management of recurrent colorectal cancer.