Publications [#133549] of Terry T Yoshizumi

Papers Published

1. CL Hollingsworth, TT Yoshizumi, DP Frush, FP Chan, G Toncheva, G Nguyen, CR Lowry, LM Hurwitz, Pediatric cardiac-gated CT angiography: assessment of radiation dose., AJR. American journal of roentgenology, vol. 189 no. 1 (July, 2007), pp. 12-8, ISSN 1546-3141 [doi]
   (last updated on 2013/07/01)

   Abstract:
   OBJECTIVE: The purpose of our study was to determine a dose range for cardiac-gated CT angiography (CTA) in children. METHODS: ECG-gated cardiac CTA simulating scanning of the heart was performed on an anthropomorphic phantom of a 5-year-old child on a 16-MDCT scanner using variable parameters (small field of view; 16 x 0.625 mm configuration; 0.5-second gantry cycle time; 0.275 pitch; 120 kVp at 110, 220, and 330 mA; and 80 kVp at 385 mA). Metal oxide semiconductor field effect transistor (MOSFET) technology measured 20 organ doses. Effective dose calculated using the dose-length product (DLP) was compared with effective dose determined from measured absorbed organ doses. RESULTS: Highest organ doses included breast (3.5-12.6 cGy), lung (3.3-12.1 cGy), and bone marrow (1.7-7.6 cGy). The 80 kVp/385 mA examination produced lower radiation doses to all organs than the 120 kVp/220 mA examination. MOSFET effective doses (+/- SD) were as follows: 110 mA: 7.4 mSv (+/- 0.6 mSv), 220 mA: 17.2 mSv (+/- 0.3 mSv), 330 mA: 25.7 mSv (+/- 0.3 mSv), 80 kVp/385 mA: 10.6 mSv (+/- 0.2 mSv). DLP effective doses for diagnostic runs were as follows: 110 mA: 8.7 mSv, 220 mA: 19 mSv, 330 mA: 28 mSv, 80 kVp/385 mA: 12 mSv. DLP effective doses exceeded MOSFET effective doses by 9.7-17.2%. CONCLUSIONS: Radiation doses for a 5-year-old during cardiac-gated CTA vary greatly depending on parameters. Organ doses can be high; the effective dose may reach 28.4 mSv. Further work, including determination of size-appropriate mA and image quality, is important before routine use of this technique in children.

   Keywords:
   Angiography* • Body Burden* • Child, Preschool • Electrocardiography • Humans • Radiation Dosage • Radiation Protection • Radiometry • Relative Biological Effectiveness • Risk Assessment • Tomography, X-Ray Computed* • Whole-Body Counting • instrumentation • methods • methods*