8th Baltic Congress of Radiology

Neuroradiology

oral abstract

Computed tomography (CT) has a tremendous impact for stroke diagnosis and timely treatment. Diagnosing stroke while using CT angiography and perfusion combination is a great alternative for the gold standard interventional angiography. However, CT is an imaging technique that uses ionizing radiation that is why it is important to uphold safety precautions and optimize scanning protocols. The objective of this research is to compare CT angiography and perfusion protocols with the most optimal protocols from literature. Also determine average radiation doses during brain CT angiography and perfusion and compare them with the most optimal found in literature.

Research was done in X hospital Radiology clinic. During the research were compared GE Revolution CT scanner brain angiography and perfusion protocols with protocols found in literature. Also cerebral CT angiography and perfusion radiation doses were recorded from the dose report and were compared with the lowest optimal doses found in literature. Overall, 415 cerebral CT angiography and perfusion dose reports were analyzed.

In X hospital CT Dose Index (CTDI) of head and neck CT angiography is 1,5 greater (average CTDI 5,93 mGy) comparing with the lowest optimal doses found in literature. Performing brain CT perfusion CTDI is 1,8 greater (average CTDI 217,56 mGy). In X hospital X-ray tube voltage of head and neck CT angiography protocol is 120 kV or 100 kV when the limit in literature is 80 kV. Performing cerebral CT perfusion the X-ray tube current is higher than the most optimal recommendations from literature and reaches 500 mA.

During the research it was found that protocols used by X hospital for cerebral CT angiography and perfusion could be optimized better. Using X hospital cerebral CT angiography and perfusion protocols radiation doses are greater than the lowest recommended but still remain lower than the optimal found in literature.

Cerebral CT angiography and perfusion combination has a tremendous impact for stroke diagnosis and timely treatment. However, CT is an imaging technique that uses ionizing radiation. The aim of this research is to evaluate optimization possibilities of cerebral CT angiography and perfusion protocols parameters. During the research it was found that cerebral CT angiography and perfusion protocols could be optimized better and doses are greater than the lowest recommended in literature.

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