Publication: Comparison of low dose and standard dose MDCT in detection of metastatic pulmonary nodules
Issued Date
2011-02-01
Resource Type
ISSN
01252208
01252208
01252208
Other identifier(s)
2-s2.0-79952337769
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of the Medical Association of Thailand. Vol.94, No.2 (2011), 215-223
Suggested Citation
Nisa Muangman, Ngarmchit Maitreesorrasan, Kanyarat Totanarungroj Comparison of low dose and standard dose MDCT in detection of metastatic pulmonary nodules. Journal of the Medical Association of Thailand. Vol.94, No.2 (2011), 215-223. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/12663
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Comparison of low dose and standard dose MDCT in detection of metastatic pulmonary nodules
Other Contributor(s)
Abstract
Objective: Compare low dose (50 mA) and standard dose (300 mA) MDCT in detection of metastatic pulmonary nodules in extrathoracic malignant patients in Siriraj hospital. Material and Method: Prospectively, 58 patients underwent chest CT examinations by 64-slice MDCT in non-enhanced phase with a reduced tube current of 50 mA (low-dose CT (LDCT)), followed by contrast-enhanced phase with a standard tube current of 300 mA (Standard-dose CT (SDCT)). Other parameter such as tube voltage 120 kVp, spiral pitch 0.984, and section thickness 1.25 mm, were kept constant. Four hundred twenty two nodules found by SDCT and 427 nodules found by LDCT were analyzed. Results: The sensitivity of LDCT was 94.7% for all nodules, 79% for nodules < 2 mm, 94.2% for nodules 2.1-3 mm, 97% for nodules 3.1-4 mm, and 100% for nodules 4.1-5 mm. Three types of nodules were found and classified as calcific nodule, non-calcific nodule, and ground-glass nodule of which sensitivity for detection in LDCT were 100% (p = 1.000), 95.9% (p = 0.337) and 77% (p = 0.581), respectively. Most common causes of discrepancy in SDCT were unseen nodules and in LDCT were end-on vessel nodules. Majority of discrepant nodules and retrospective nodules were < 3 mm. Effective dose ranged from 0.78 mSv.-1.6 mSv in LDCT and 4.22-9.57 mSv in SDCT. Conclusion: There is no statistical difference in detection of metastatic pulmonary nodules by using low-dose and standard-dose CT images. Low-dose CT images can used to follow-up the treatment responsiveness of the known patient, diagnosed to have pulmonary metastasis.