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→Justification in protection of patients
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Medical exposure of patients has unique considerations that affect how the fundamental principles of radiological protection are applied. Such uniqueness is reflected in the application of all three principles in the protection of patients.<ref name="Pub103"/><ref name="Pub105"/>
===Justification in protection of patients===[[file:JustificationInMedicine.jpg|350px|thumb]]Justification in radiological protection of patients is different from justification of other radiation applications, in that generally the very same person enjoys the benefits and suffers the risks associated with a procedure. Dose limits are not directly relevant, since ionising radiation, used for medically indicated purpose and at the appropriate level of dose, is an essential tool that will cause more good than harm.<ref name="Pub105"/>
There are three levels of justification of a radiological practice in medicine: (1) At the first and most general level, the proper use of radiation in medicine is accepted as doing more good than harm to the society. This general level of justification is now taken for granted; (2) At the second level, a specified procedure with a specified objective is defined and justified (e.g. chest x rays for patients showing relevant symptoms). The aim of the second level of justification is to judge whether the radiological procedure will improve the diagnosis or treatment, or will provide necessary information about the exposed individuals. The total benefits from a medical procedure include not only the direct health benefits to the patient, but also the benefits to the patient’s family and to the society; (3) At the third level, the application of the procedure to an individual patient should be justified (i.e. the particular application should be judged to do more good than harm to the individual patient).
