Optimization Of Low-Kilovoltage CT Scanning Parameters And The Evaluation Of Pancreatic Enhancement

This study adopted low-kilovoltage CT scanning and took phantoms and patients without pancreatic disease as research materials, which was divided into two parts.Part One: Optimization of low-kilovoltage CT scanning parameters:phantom studyObjective: Sieving optimal scanning parameters of low-kilovoltage CT scanning. Materials and methods: The phantom (Catphan500) and a standard phantom were scanned with GE Hispeed/I helical CT scanner. The scanning parameters were as follows: The tube voltage: 80kv, 100kv and 120kv respectively; the tube current-time product settings: 200-600mAs; section thickness: 1-10mm; section interval: 0mm; scan field of view: 48cm; display field of view: 35cm. After scanning, the images were reconstructed by soft, standard, lung, detail, bone, edge, reconstruction algorithm. The standard phantom was scanned at 120kV and 200mAs, 100kV and 300mAs, 80kV and 400mAs, pitch: 1.0, 1.5 and 2.0. Weighted CT dose index, image noise, contrast-to-noise ratio and low-contrast detectability were measured. Results: The CTDIW at 80Kv and 200-600mAs and 100kV and 200-300mAs were lower than 120kV and 200mAs, the image noise were higher accordingly. The differences of contrast-to-noise ratio and low-contrast detectability were not significant among 80Kv and 400mAs, 100kV and 300mAs, 120kV and 200mAs, p<0.05. Conclusion: The 80Kv and 400mAs was the optimal parameters of chest low-kilovoltage CT scanning, 100kV and 300mAs of abdomen.Part Two: Application of low-kilovoltage CT scanning to pancreatic enhancementObjective: To assess the value of low-kilovoltage CT scanning enhanced scanning of pancreas. Materials and methods: A total of 120 patients were divided at random into four groups with different scanning parameters and injection techniques. Groupâ… ...