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Dynamic SPECT with iodine-123 IMP in meningiomas
S Nakano1, K Kinoshita, S Jinnouchi
1Department of Neurosurgery, Miyazaki Medical College, Japan.
Summary
Dynamic single photon emission computed tomography (SPECT) using [123I]IMP effectively evaluates meningioma vascularity. This imaging technique accurately differentiates tumor types based on blood flow characteristics.
Area of Science:
- Nuclear Medicine
- Neuro-oncology
- Radiology
Background:
- Meningiomas are primary tumors of the brain and spinal cord.
- Accurate assessment of meningioma vascularity is crucial for diagnosis and treatment planning.
- Angiography and histology provide insights but can be invasive or delayed.
Purpose of the Study:
- To evaluate the utility of dynamic single photon emission computed tomography (SPECT) with N-isopropyl-p-[123I]iodoamphetamine ([123I]IMP) for assessing meningioma vascularity.
- To correlate [123I]IMP uptake and washout patterns with angiographic findings and histological tumor types.
Main Methods:
- Dynamic SPECT imaging was performed in 12 patients with meningiomas after intravenous [123I]IMP administration.
- Regions of interest (ROIs) were defined over the lesion and contralateral normal tissue.
- Time-activity curves (TACs) were analyzed, and lesion-to-normal tissue (L/N) ratios were calculated.
Main Results:
- TACs were classified into three types based on uptake and washout patterns.
- Angioblastic meningiomas showed high L/N ratios (>300%), while fibroblastic meningiomas had lower ratios (≤105%).
- A strong correlation was observed between L/N ratios, angiographic vascularity, and histological subtypes.
Conclusions:
- Dynamic SPECT with [123I]IMP is a valuable, non-invasive tool for evaluating meningioma vascularity.
- This imaging modality aids in differentiating meningioma subtypes based on their vascular characteristics.
- Dynamic SPECT offers a comprehensive assessment superior to traditional methods for lesion vascularity.