当前位置： SCI文献检索 > ACADEMIC RADIOLOGY期刊下所有文献 > Comparison of radiation dose estimates and scan performance in pediatric high-resolution thoracic CT for volumetric 320-detector row, helical 64-detector row, and noncontiguous axial scan acquisitions.

Comparison of radiation dose estimates and scan performance in pediatric high-resolution thoracic CT for volumetric 320-detector row, helical 64-detector row, and noncontiguous axial scan acquisitions.

Abstract：

RATIONALE AND OBJECTIVES:Efforts to decrease radiation exposure during pediatric high-resolution thoracic computed tomography (HRCT), while maintaining diagnostic image quality, are imperative. The objective of this investigation was to compare organ doses and scan performance for pediatric HRCT using volume, helical, and noncontiguous axial acquisitions. MATERIALS AND METHODS:Thoracic organ doses were measured using 20 metal oxide semiconductor field-effect transistor dosimeters. Mean and median organ doses and scan durations were determined and compared for three acquisition modes in a 5-year-old anthropomorphic phantom using similar clinical pediatric scan parameters. Image noise was measured and compared in identical regions within the thorax. RESULTS:There was a significantly lower dose in lung (1.8 vs 2.7 mGy, P < .02) and thymus (2.3 vs 2.7 mGy, P < .02) between volume and noncontiguous axial modes and in lung (1.8 vs 2.3 mGy, P < .02), breast (1.8 vs 2.6 mGy, P < .02), and thymus (2.3 vs 2.4 mGy, P < .02) between volume and helical modes. There was a significantly lower median image noise for volume compared to helical and axial modes in lung (55.6 vs 79.3 and 70.7) and soft tissue (76.0 vs 111.3 and 89.9). Scan times for volume, helical, and noncontiguous axial acquisitions were 0.35, 3.9, and 24.5 seconds, respectively. CONCLUSION:Volumetric HRCT provides an opportunity for thoracic organ dose and image noise reduction, at significantly faster scanning speeds, which may benefit pediatric patients undergoing surveillance studies for diffuse lung disease.

journal_name

Acad Radiol

journal_title

Academic radiology

authors

Podberesky DJ,Angel E,Yoshizumi TT,Toncheva G,Salisbury SR,Brody AS,Alsip C,Barelli A,Egelhoff JC,Anderson-Evans C,Nguyen GB,Dow D,Frush DP

doi

10.1016/j.acra.2013.05.013

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

1152-61

issue

9

eissn

1076-6332

issn

1878-4046

pii

S1076-6332(13)00269-9

journal_volume

20

pub_type

杂志文章

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