Effective dose in paediatric computed tomography.

There is limited data currently available for making dose and risk assessments for paediatric patients undergoing computed tomographic examination. A method has been developed to correlate the risk-related quantity, effective dose, to the more simply derived quantity dose-length product. This involved scanning a series of paediatric anthropomorphic phantoms containing thermoluminescent dosimeters to measure effective dose for scans of various anatomic regions. The quantity effective dose per dose-length product was calculated and plotted as a function of patient size. This showed a simple exponential relationship, and equations of fit were derived to enable the calculation of effective dose for a patient of any size. Measurements carried out on a second scanner and for alternative scan volumes indicated that the method could be generally utilized.

[1]  M. Cristy,et al.  Active bone marrow distribution as a function of age in humans. , 1981, Physics in medicine and biology.

[2]  S. Mattsson,et al.  On the calculation of effective dose to children and adolescents , 1996 .

[3]  R. Brasch,et al.  Computed tomographic scanning in children: II. An updated comparison of radiation dose and resolving power of commercial scanners. , 1982, AJR. American journal of roentgenology.

[4]  W Huda,et al.  Effective doses to patients undergoing thoracic computed tomography examinations. , 2000, Medical physics.

[5]  W Huda,et al.  An approach for the estimation of effective radiation dose at CT in pediatric patients. , 1997, Radiology.

[6]  S. Edyvean,et al.  CT scanner dosimetry. , 1998, The British journal of radiology.

[7]  T. Fearon,et al.  Normalized pediatric organ-absorbed doses from CT examinations. , 1987, AJR. American journal of roentgenology.

[8]  K. Faulkner,et al.  Automated thermoluminescent dosimetry for simple radiographic procedures , 1997 .

[9]  R. A. Tawil,et al.  A TLD System Based on Gas Heating with Linear Time-Temperature Profile , 1990 .

[10]  T. Fearon,et al.  Pediatric patient exposures from CT examinations: GE CT/T 9800 scanner. , 1985, AJR. American journal of roentgenology.

[11]  B. Wall,et al.  Reference Doses for Paediatric Computed Tomography , 2000 .

[12]  B. Lindskoug,et al.  The Reference Man in diagnostic radiology dosimetry. , 1992, The British journal of radiology.

[13]  Maria Zankl,et al.  Organ Doses for Children from Computed Tomographic Examinations , 1995 .