Computer-Simulated Radiation Dose Reduction for Abdominal Multidetector CT of Pediatric Patients
Donald P. Frush1,
Christopher C. Slack2,
Caroline L. Hollingsworth1,
George S. Bisset1,
Lane F. Donnelly3,
Jiang Hsieh2,
Trudy Lavin-Wensell1 and
John R. Mayo4
1 Division of Pediatric Radiology, 1905 McGovern-Davison Children's Health
Center, Box 3808, Department of Radiology, Duke University Medical Center,
Erwin Rd., Durham, NC 22710.
2 General Electric Medical Systems, 3000 N. Grandview Blvd., Waukesha, WI
53188.
3 Department of Radiology, Children's Hospital and Medical Center, 3333 Burnet
Ave., Cincinnati, OH 45229.
4 Department of Radiology, University of British Columbia and Vancouver Hospital
and Health Sciences Centre, 855 W. 12th Ave., Vancouver, Canada V5Z 1M9.
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Fig. 1A. —Comparison of computer-simulated images and multidetector CT
(MDCT) scans obtained with true tube currents in 25-cm water phantom. Except
for tube current, all parameters are identical. MDCT scans obtained with
serial reductions in tube current show relatively increased noise.
Corresponding images with simulated tube current reductions are identical in
appearance to those obtained with actual reduced tube current. Two other
simulations (not shown) were performed at 100 and 60 mA. MDCT scans were
obtained at true 120 (A) and true 80 (B) mA.
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Fig. 1B. —Comparison of computer-simulated images and multidetector CT
(MDCT) scans obtained with true tube currents in 25-cm water phantom. Except
for tube current, all parameters are identical. MDCT scans obtained with
serial reductions in tube current show relatively increased noise.
Corresponding images with simulated tube current reductions are identical in
appearance to those obtained with actual reduced tube current. Two other
simulations (not shown) were performed at 100 and 60 mA. MDCT scans were
obtained at true 120 (A) and true 80 (B) mA.
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Fig. 1C. —Comparison of computer-simulated images and multidetedtor CT
(MDCT) scans obtained with true tube currents in 25cm water phantom. Except
for tube current, all parameters are identical. MDCT scans obtained with
serial reductions in tube current show relatively increased noise.
Corresponding images with simulated tube current reductions are identical in
appearance to those obtained with actual reduced tube current. Two other
simulations (not shown) were performed at 100 and 60 mA. MDCT scan was
obtained at true 40 mA.
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Fig. 1D. —Comparison of computer-simulated images and multidetedtor CT
(MDCT) scans obtained with true tube currents in 25cm water phantom. Except
for tube current, all parameters are identical. MDCT scans obtained with
serial reductions in tube current show relatively increased noise.
Corresponding images with simulated tube current reductions are identical in
appearance to those obtained with actual reduced tube current. Two other
simulations (not shown) were performed at 100 and 60 mA. Computer-simulated
images were obtained at 80 (D) and 40 (E) mA.
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Fig. 1E. —Comparison of computer-simulated images and multidetedtor CT
(MDCT) scans obtained with true tube currents in 25cm water phantom. Except
for tube current, all parameters are identical. MDCT scans obtained with
serial reductions in tube current show relatively increased noise.
Corresponding images with simulated tube current reductions are identical in
appearance to those obtained with actual reduced tube current. Two other
simulations (not shown) were performed at 100 and 60 mA. Computer-simulated
images were obtained at 80 (D) and 40 (E) mA.
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Fig. 2A. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Original MDCT scan obtained with true tube current of 120 mA at
level of upper poles of kidneys.
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Fig. 2B. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Computer-simulated images at level of upper poles of kidneys
were obtained with serial dose reductions of 100 (B), 80 (C),
and 60 (D) mA.
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Fig. 2C. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Computer-simulated images at level of upper poles of kidneys
were obtained with serial dose reductions of 100 (B), 80 (C),
and 60 (D) mA.
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Fig. 2D. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Computer-simulated images at level of upper poles of kidneys
were obtained with serial dose reductions of 100 (B), 80 (C),
and 60 (D) mA.
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Fig. 2E. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Computer-simulated image at level of upper poles of kidneys was
obtained at 40 mA. Note that intrahepatic course of falciform ligament in
intralobar fissure (large straight arrow) and lower aspects of both
adrenal glands (small straight arrows), both high-visibility
structures, are evident even on 40-mA simulated image. Hepatic artery
(curved arrow), considered low-visibility structure, was evident on
this single image at 40 mA but was not seen at as many levels with lower tube
current simulations.
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Fig. 2F. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Original MDCT scan was obtained with 120 mA at level of mid
kidneys. Common bile duct (curved arrow) can be identified next to
ampulla of Vater, and intraparenchymal vessels (straight arrows) are
visible.
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Fig. 2G. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Increased noise in simulated images at level of mid kidneys
obscures several intraparenchymal vessels that are well depicted on original
120-mA MDCT scan. In original scan (F), adjacent common bile duct is
also easier to identify next to ampulla of Vater. Note that two renal cysts
(small arrows, H) in right kidney are identified even in 40-mA
simulation (H).
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Fig. 2H. —Comparison of computer-simulated images and multidetector CT
(MDCT) scan obtained with true tube current. For evaluation of renal cysts
seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of
upper abdomen. Increased noise in simulated images at level of mid kidneys
obscures several intraparenchymal vessels that are well depicted on original
120-mA MDCT scan. In original scan (F), adjacent common bile duct is
also easier to identify next to ampulla of Vater. Note that two renal cysts
(small arrows, H) in right kidney are identified even in 40-mA
simulation (H).
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Copyright © 2002 by the American Roentgen Ray Society.
