The application of 320-slice CT " double-low" MIP imaging technique in obstructive sleep apnea syndrome with coronary heart disease

Objective To evaluate the value of 320-slice computed tomography (CT) " double-low" maximum density projection (MIP) imaging protocol (low tube voltage and low contrast agent concentration) in obstructive sleep apnea syndrome (OSAS) with coronary heart disease. Methods 40 cases of OSAS with coronary heart disease in our hospital were selected. All patients underwent 320-slice CT " double-low" MIP imaging and received conventional coronary angiography (CAG) within 1 month. With reference to CAG examination results, the accuracy of 320-slice CT " double low" MIP-imaging technique in diagnosing the Obstructive sleep apnea syndrome with coronary heart disease can be evaluated. Results The sensitivity, specificity, accuracy, positive predictive value and negative predictive value of 320-slice CT" double-low " MIP imaging in the diagnosis of obstructive respiratory sleep disorder with coronary disease were 95.14%, 94.43%, 95.33%, 83.62%, 98.20%. respectively. The heart rate of testers was (65.20±4.79)bpm/min, the dose length product (DLP) was (98.22±32.54)mGy·cm, and the effective radiation dose (ED) was (1.35±0.42)mSv. Conclusions Compared with CAG, the 320-slice CT " double-low" MIP imaging technique reduced doses of radiation while maintained the good quality of image. Therefore, this technique has high application value as a clinical diagnosis method to diagnose patients with obstructive respiratory sleep disorder and coronary heart disease. Key words: Sleep apnea, obstructive; Coronary disease; Tomography, X-ray computed