The Study Of 16-slice CT In Obstructive Sleep Apnea Syndrome

PART I: The study of MSCT about OSAS in awakeOBJECTIVE: To define the characteristic values to divide the OSAS from the healthy by comparing the measurement and scale between the two groups. MATERIALS AND METHODS: 68 OSAS patients and 56 healthy were measured by GE LightSpeed 16 CT in awake. Then, compare the measurement and scale between the two groups. RESULT: 35 values were statistical difference among the 64 values between the two groups. 4 values were selected into the Wilks' Lambda.CONCLUSION: Many measurement and scale were statistical difference between the two groups, but there was superposition between the measurement. Wilks' Lambda can help the diagnosis of OSAS.PART II: The using of low dose MSCT in the diagnosis of pharynxOBJECTIVE: Finding the good low dose MSCT condition to examine the pharynx disease. MATERIALS AND METHODS: 20 volunteers were scannedby using 10mm collimation, 10mm interval, 120KV, 200mA, 100mA, 50mA, 25mA parameters, respectively. All of the data was reformed (collimation 2.5mm,interval 1.3mm) on ADW4.0 workstation. 4 experienced radiologists were requested to compare the image quality in different dose. RESULT: the image quality of 120KV, 50mA was equal to that of 100mA but higher than 25mA and lower than 200mA.CONCLUSION: Low dose (10mm collimation, 10mm interval, 120KV, 50mA) scan mode isure the image quality and low exposure and expense.PART III: Study of low dose and dynamic MSCT about OSAS in sleeping OBJECTIVE: To examine the location, extension and cause of collapsed airway in sleeping OSAS patients by using low dose and dynamic MSCT. MATERIALS AND METHODS: 16 OSAS patients were scanned both in awake and sleeping period (inspiration and expiration phase). All patients were also scanned using cine mode at the level of the smallest area. Compare to the measurement among the three phases and record the location of the smallest or occlusion, respectively. RESULT: The L and the smallest XSA of RP region were statistical difference among three phases, however, the AP, volume of RP region and the L, the smallest XSA of RG region were different between inspiration and expiration. CONCLUSION: 1. 3D and cine scan during sleeping can clearly show the location, length and cause of occlusion. 2. Low dose MSCT scan reduced exposure and expense.