Medicine in evolution








- Abstract -

Because of the greater children sensibility to X-rays we have evaluated the received X rays doses for pediatric thorax examinations on groups separated on age criteria and image detectors; bath classic film and light enhancer and digital systems. Determination place was a pediatric clinic.

We selected two X-ray machines from the same generation, both with anatomic programmator and automatic exposure control (AEC). Received X ray doses are measured with a measuring ionization chamber mounted on the X ray collimator, results are expressed in doses×area. From all examinations we have selected the thorax in PA-AP projection. The age groups are: <1 year, 1 -3, 4 -7, 8 – 11, 12 -16.

Registered data: patient age, working tension (kV), examination field size and DAP (doses area product). For the working tension analysis, we followed the mode value and for DAP the average value. The X ray machine with digital detector generates through the anatomic programator a value of 110kV for all age groups and a DAP value between 6, 1 and 49,8μGy×m2. The classic X ray machine generates through the anatomic programmator tensions of 65, 73, 77, 90 and 102kV, a DAP value between 3 and 8,3μGy×m2.

We have supplementary measured the dose on the patients entering surface motivated by the great difference of the DAP values between the two types of detectors. The previous obtained DAP values have been confirmed with the second method too. Deeper research is necessary to determine the cause for the great differences of DAP values.

Key words: sensibility to X-rays, X rays doses, doses area product.



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