This study was an estimation survey of the overall rate in counting data, aiming for a positive rate with a keypoint within a specific-diameter circle. The difference between the sample rate (a) and the overall rate (P) was expected to be no more than 10%. Based on the sample rate of a small-scale presurvey, P=80% and a = 0.05, while the sample size = (Ua/δ)/P(1 − P), where δ = 0.10, P=0.88, a = 0.05, and Ua = 1.96 (U α is the U value corresponding to the significance level, and δ is error).
The expected sample size was finally calculated as 123 cases. Finally, for this study, 79 patients who underwent thin-section CT of the head in Enze Medical Center (Group), Enze Hospital, were randomly selected for an anatomical study. All the patients were Chinese nationals, including 97 male and 52 female patients. The minimum age was nine years old, and the maximum was 78, with 74 cases involving the left side of the skull and 75 cases involving the right. Imaging data were reconstructed using workstation (GE ADW4.6) 3D CT software (General Electric Company, USA) to create 3D skull images.
Images containing any unclear surface markers were excluded. A total of 149 hemiskull base 3D images from 79 patients were adequate for analysis (clear visualization of the entire mastoid process, the asterion, the digastric groove apex, the external auditory canal, the transverse sinus sulcus, and the sigmoid sinus sulcus).
The expected sample size was finally calculated as 123 cases. Finally, for this study, 79 patients who underwent thin-section CT of the head in Enze Medical Center (Group), Enze Hospital, were randomly selected for an anatomical study. All the patients were Chinese nationals, including 97 male and 52 female patients. The minimum age was nine years old, and the maximum was 78, with 74 cases involving the left side of the skull and 75 cases involving the right. Imaging data were reconstructed using workstation (GE ADW4.6) 3D CT software (General Electric Company, USA) to create 3D skull images.
Images containing any unclear surface markers were excluded. A total of 149 hemiskull base 3D images from 79 patients were adequate for analysis (clear visualization of the entire mastoid process, the asterion, the digastric groove apex, the external auditory canal, the transverse sinus sulcus, and the sigmoid sinus sulcus).
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