Journal of Health and Medical Sciences
Volumen 5, Fascículo 3, 2019
Artículo de Investigación
Armonización del Registro de Exposición de Pacientes a través del Kerma Incidente en Aire

de las Heras Gala1,2,; F. Schöfer 1; R. M. Sánchez Casanueva3; J. M. Fernández Soto3; K. Mair4; T. de las Heras Gala1; B. Renger5; L. Corpas6; A. Dolcet Llerena6 & H. Schlattl7

  1. Quality Assurance in Radiological Technologies (QUART), Zorneding, Alemania.
  2. Bundesamt für Strahlenschutz, Oberschleißheim, Alemania.
  3. Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, España.
  4. Strahlentherapie Süd, Kempten, Alemania.
  5. Klinikum Rechts der Isar, Munich, Alemania.
  6. Gestisa, Madrid, España.
  7. Institute of Radiation Protection, Helmholtz Zentrum München, Neuherberg, Alemania.

La correspondencia debe dirigirse a Hugo de las Heras Gala. Email: hugo.heras@daad-alumni.de

Recibido el 25 de Marzo de 2018. Aceptado el 04 de Mayo de 2018

DE LAS HERAS-GALA, H.; SCHÖFER, F.; SÁNCHEZ-CASANUEVA, R. M.; FERNÁNDEZ-SOTO, J. M.; MAIR, K.; DE LAS HERAS-GALA, T.; RENGER, B.; CORPAS, L.; DOLCET-LLERENA, A. & SCHLATTL, H. Harmonization of the registration of patients exposure through Incident air kerma. J. health med. sci., 5(3):153-159, 2019.

ABSTRACT: The initial aim of this research work was to propose a tool to support the Bonn Call for Action and reply to the needs mentioned by IAEA in terms of radiological safety in medicine.  The suggestion to meet those needs is using Incident Air Kerma (Ka,i) as a harmonizing parameter for the registration of doses in every X-ray modalities since it is the simplest exposure parameter. In fact, this parameter is already been used in 2D modalities as in radiography, mammography, and intra-oral radiology. This work offers specific instructions to apply this dosimetry to 3D modalities (such as computerized tomography or CT, including cone beam devices or CBCT). For this, we have found an arithmetic relationship that includes the geometrical parameters of the device (such as the focus-to-detector distance) and a measurment of the Ka,i, which can be performed during the acceptance test (without any phantoms). Using these data, as well as the “mAs” value and the perimeter of the irradiated area, the incident kerma at the skin can be estimated for any patient with an uncertainty of less than 7%. Based on the collected results we got for equipment data from every tomographic modality, reference levels for an intermediate pediatric patient or a head examination (16 cm diameter) would be, respectively, 5, 20 and 35 mGy for low dose procedures (dental or guided radiotherapy), medium dose (CT) or high dose (angiography high resolution). This dosimetry based on the Ka,i offers an alternative that is centered on the patient, unlike computed tomography dose index or dose-length product measures, for the standard quality control, as well as the possibility to compare the exposure of specific patients among all modalities of diagnostic radiology.

KEY WORDS: incident air kerma, dosimetry, diagnostic radiology, Bonn call for action.

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