[Dynamic computed tomography of brain tumor]

Area of Science:

• Neuroradiology
• Medical Imaging
• Oncology

Background:

• Dynamic computed tomography (CT) is a simple imaging technique.
• Regional cerebral perfusion in brain tumors requires critical evaluation.
• Existing methods lack detailed assessment of tumor perfusion parameters.

Purpose of the Study:

• To evaluate parameters from dynamic CT perfusion studies in brain tumors.
• To clarify the usefulness of dynamic CT by comparing it with Xenon-enhanced CT.
• To differentiate tumor tissue characteristics and invasiveness.

Main Methods:

• Dynamic CT performed on 20 brain tumor patients (meningiomas, pineal tumors, metastatic tumors, gliomas).
• Six rapid sequential scans post-contrast injection.
• Analysis of five parameters (corrected first moment, area, peak, time to peak, percent terminal height) from time-density curves.
• Comparison with Xenon-enhanced CT (Xe-CT) measuring cerebral blood flow (CBF).

Main Results:

• Meningiomas showed higher area and percent terminal height, indicating increased blood volume and extravasation.
• Metastatic tumors and malignant gliomas exhibited elevated parameters, suggesting increased blood volume and blood-brain barrier breakdown.
• Non-enhanced gliomas showed higher corrected first moment and time to peak, with lower area and peak, indicating decreased blood volume and delayed transit times.
• Dynamic CT parameters correlated with Xe-CT findings, identifying viable tumor cells and invasive sites.

Conclusions:

• Dynamic CT perfusion parameters provide valuable insights into brain tumor characteristics.
• The study demonstrates dynamic CT's ability to assess intratumoral blood volume and blood-brain barrier status.
• Dynamic CT can distinguish viable tumor tissue and identify invasive tumor margins, aiding in diagnosis and treatment planning.