Functional CT imaging of prostate cancer

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Prostate cancer diagnosis and staging rely on various clinical investigations.
• Understanding tumor microenvironment characteristics like blood flow is crucial for treatment planning.

Purpose of the Study:

• To investigate the distribution of blood flow (F), mean capillary transit time (Tc), capillary permeability (PS), and blood volume (vb) in prostate cancer.
• To generate functional maps of these parameters using contrast-enhanced CT and a tracer kinetic model.
• To compare functional map findings with standard clinical investigations.

Main Methods:

• Utilized contrast-enhanced computed tomography (CT) in nine patients with stage T2-T3 prostate cancer.
• Acquired time-series CT images post-contrast agent injection.
• Applied a distributed parameter tracer kinetic model (adiabatic approximation to tissue homogeneity model) to generate functional maps.
• Assessed map precision using covariance matrix analysis.

Main Results:

• Functional maps identified regions of increased blood flow (F), permeability (PS), and blood volume (vb) in eight patients.
• The locations of these increased parameters correlated with standard clinical findings.
• Precise measurement of parameters beyond blood flow was limited to regions with high F.

Conclusions:

• Contrast-enhanced CT functional imaging demonstrates elevated blood flow, permeability, and volume in prostate cancer.
• Complex tracer kinetic models require careful application in prostate cancer studies due to parameter precision limitations.
• Further research is needed to refine model parameters for comprehensive assessment.