Evaluation of image quality using 1 : 1 pitch and 1.5 : 1 pitch helical CT in children: a comparative study.
作者信息
Vade A, Demos T C, Olson M C, Subbaiah P, Turbin R C, Vickery K, Corrigan K
机构信息
Department of Radiology, Loyola University Medical Center, 2160 S. First Avenue, Maywood, IL 60153, USA.
出版信息
Pediatr Radiol. 1996 Dec;26(12):891-3. doi: 10.1007/BF03178045.
OBJECTIVE
The objective of this study was to compare the quality of 1 : 1 and 1.5 : 1 pitch helical contrast-enhanced thoracic and abdominal CT images in children who cannot cooperate for breath holding.
MATERIALS AND METHODS
This is a retrospective study of 33 contrast-enhanced CT examinations in 11 children of 0-4 years of age. All children had an initial CT study using 1 : 1 pitch helical scanning followed over the next 6-36 months by one to four CT examinations with 1.5 : 1 pitch. Radiation dose with the two techniques was measured with a pencil ionization chamber.
RESULTS
The two techniques provided comparable overall image quality. There was 33 % less radiation dose with 1.5 : 1 pitch helical scanning.
CONCLUSION
The 1.5 : 1 pitch helical CT provides comparable quality images and a smaller radiation dose than 1 : 1 pitch in examining children aged 0-4 years.
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