Korean J Med Phys.  2010 Sep;21(3):246-252.

Estimate of Radiation Doses in MDCT Using Patient Weight

• Kwon SO
• Dong KR
• Kweon DC
• Goo EH
• Choi J
• Chung WK

Abstract

The purpose of this study provides measurements of radiation dose from MDCT of head, chest, abdomen and pelvic examinations. A series of dose quantities that are measured of patient weight to compare the dose received during MDCT examinations. Data collected included: weight together with CT dose descriptors, volume CT dose index (CTDIvol) and dose length product (DLP). The effective dose was also estimated and served as collective dose estimation data. Data from 1,774 adult patients attending for a CT examination of the head (n=520) or chest (n=531) or abdomen (n=724) was obtained from spiral CT units using a same CT protocol. Mean values of CTDIvol was a range of 48.6 mGy for head and 6.9, 10.5 mGy for chest, abdomen examinations, respectively. And mean values of DLP was range of 1,604 mGy.cm for head, 250 mGy.cm for chest, 575 mGy.cm for abdomen examinations, respectively. Mean effective dose values for head, chest, abdominal CT were 3.6, 4.2, and 8.6 mSv, respectively. The degree of CTDIvol and DLP was a positive correlation with weight. And there was a positive correlation for weight versus CTDIvol (r2=0.62), DLP (r2=0.694) in chest. And head was also positive correlation with weight versus CTDIvol (r2=0.691), DLP (r2=0.741). We conclude that CTDIvol and DLP is an important determinant of weight within the CT examinations. The results for this study suggest that CT protocol should be tailored according to patient weight.

Keyword

CT; Radiation dose; CTDI; CTDIvol; DLP

MeSH Terms

Abdomen
Adult
Antineoplastic Combined Chemotherapy Protocols
Cone-Beam Computed Tomography
Cytarabine
Gynecological Examination
Head
Humans
Subject Headings
Thioguanine
Thorax
Tomography, Spiral Computed
Antineoplastic Combined Chemotherapy Protocols
Cytarabine
Thioguanine