Article Figures & Data
Figures
- Fig 1.
Scanning baseline and coverage of temporal bone CT: glabellomeatal line, the baseline of the sequential axial scanning mode (a); a line parallel to the acanthiomeatal line passing by the superior edge of the temporal bone, the upper limit of the modified helical scanning mode (b); the acanthiomeatal line approximately parallel to the hard palate (c); and the scanning range of the temporal bone CT (d). The arrow is the position of lens.
- Fig 2.
Sequential axial and coronal CT images and reformatted images from the modified helical scan. A and B, Sequential axial section of the vestibulum auris (A) and a coronal section of the cochlea (B), with the structures delineated vividly. C–F, Axial, coronal, and sagittal reformatted sections from the modified helical scan with the microanatomy displayed clearly and more diagnostic information delivered.
Tables
Tilt CTDIvol (mGy) Tilt CTDIvol (mGy) 30 44.8 0 51.6 25 46.9 −5 51.6 20 48.6 −10 51.1 15 50.1 −15 50.1 10 51.1 −20 48.6 5 51.6 −25 46.9 a Scanning parameters were identical for each angle. Positive tilt values correspond to the caudal direction; negative tilt values correspond to the cranial direction.
- Table 2:
The effective doses and lens doses in different temporal bone CT scanning protocols
Scanning Mode CTDIvol (mGy) Effective Dose (mSv) Lens Organ Dose (mGy) Sequential axial 51.6 0.640, 1.21 50.96, 52.69 Sequential coronal 46.0 0.570 1.73 Routine multisection helical 51.6 0.803 40.17 Modified multisection helical 51.6 0.803 10.33 Coverage (mm) Lens Dose (mGy) 40 50.96 60 51.53 80 51.62
