Comparison of radiation dose estimates, image noise, and scan duration in pediatric body imaging for volumetric and helical modes on 320-detector CT and helical mode on 64-detector CT.
Pediatr Radiol
; 43(9): 1117-27, 2013 Sep.
Article
in En
| MEDLINE
| ID: mdl-23636537
ABSTRACT
BACKGROUND:
Advanced multidetector CT systems facilitate volumetric image acquisition, which offers theoretic dose savings over helical acquisition with shorter scan times.OBJECTIVE:
Compare effective dose (ED), scan duration and image noise using 320- and 64-detector CT scanners in various acquisition modes for clinical chest, abdomen and pelvis protocols. MATERIALS ANDMETHODS:
ED and scan durations were determined for 64-detector helical, 160-detector helical and volume modes under chest, abdomen and pelvis protocols on 320-detector CT with adaptive collimation and 64-detector helical mode on 64-detector CT without adaptive collimation in a phantom representing a 5-year-old child. Noise was measured as standard deviation of Hounsfield units.RESULTS:
Compared to 64-detector helical CT, all acquisition modes on 320-detector CT resulted in lower ED and scan durations. Dose savings were greater for chest (27-46%) than abdomen/pelvis (18-28%) and chest/abdomen/pelvis imaging (8-14%). Noise was similar across scanning modes, although some protocols on 320-detector CT produced slightly higher noise.CONCLUSION:
Dose savings can be achieved for chest, abdomen/pelvis and chest/abdomen/pelvis examinations on 320-detector CT compared to helical acquisition on 64-detector CT, with shorter scan durations. Although noise differences between some modes reached statistical significance, this is of doubtful diagnostic significance and will be studied further in a clinical setting.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Radiation Dosage
/
Radiometry
/
Artifacts
/
Phantoms, Imaging
/
Imaging, Three-Dimensional
/
Tomography, Spiral Computed
/
Whole Body Imaging
Type of study:
Diagnostic_studies
/
Guideline
Limits:
Child
/
Humans
Language:
En
Journal:
Pediatr Radiol
Year:
2013
Type:
Article
Affiliation country:
United States