The International Congress of Radiology (ICR) is a meeting of radiologists for the exchange of ideas and the harmonisation of international standards and practice, first held in 1925 in London and held at regular intervals since then. Since 1994 it has become a biennial event. Until 1953 each congress was organised by radiological society of the host country, but in that year, a formal organisation, the International Society for Radiology was set up to provide continuity between the congresses.
At the second congress, held in 1928 in Stockholm, three international commissions were set up - the International Commission on Radiological Protection (ICRP), the International Commission on Radiation Units and Measurements (ICRU) and the International Commission on Radiological Education (ICRE). The former two have become fully functional organisations in their own right while the latter has remained a sub-committee of the ICR.[ citation needed ]
Within years of Röntgen discovering X-Rays in 1895, they were being used for imaging fractured bones. Various societies sprung up in different countries where ideas were exchanged between like-minded people and national standards for the measurement of X-Ray intensity developed. These societies also tried to address the problems associated with the dangers of X-Rays, particularly cancer.
By the end of the First World War a number of proposals on how to measure the intensity of X-Rays had been made, but there was little agreement between the various parties concerned. [1] In 1925 the British Institute of Radiology, under the leadership of Charles Thurstan Holland [2] [3] invited delegates from a number of countries to attend the First International Congress on Radiation in London. This congress set up a framework for future meetings - future congresses would meet every three years in a different country, would be organised by the host country. The host country would nominate the chairman of the congress. It was also established that three commissions should be set up which would meet at the congresses:
Until the outbreak of the Second World War, congresses were held every three years. The 1940 congress was due to meet in Berlin in 1940, but was suspended due to the war. Apart from some copies of records kept by the 1973 Congress secretary-general, Benjamin Orndoff, the records of the congress, which had been handed to the German organisers in preparation for the next congress in Germany, were lost during the Second World War. [4]
The second congress was held in Stockholm under the chairmanship of Manne Siegbahn where the three commissions proposed in London met for the first time. Subsequent meetings were held in Paris (1931), Zurich (1934) and Chicago (1937).
After the war, the British Institute of Radiology organised the sixth Congress which was held in London, exactly 25 years after the first congress and in the same hall as the first congress. A total of 3364 people from 54 countries including 1,742 radiologists registered for the congress. [5] The incumbent chairman of the ICR, Arthur C. Christie, who had been nominated thirteen years before was unable to attend the London conference, so Orndoff, the secretary-general of that congress deputised handing the presidency to Ralston Paterson. The congress also saw a resumption of the work of the three international commissions.
At the seventh congress, held in Copenhagen in 1953, the organisational details of the conference were overhauled and an executive committee under the chairmanship of Lauriston S. Taylor was set up to oversee the organisation of future congresses and to provide continuity between congresses.
Before the Second World War, the location of the congresses was dictated largely by the places of residence of the delegates who had to travel by rail or sea - a delegate from the western seaboard of the United States would have to commit a month to attend a week-long ICR congress in Europe. The advent of air travel removed this restriction and subsequent congresses have since been held in many parts of the world. The following congresses have been held to date (or are scheduled): [4] [6]
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The International Society of Radiology was set up in 1953 to oversee the organisation of the International Congresses of Radiology and to provide continuity between congresses.
The 1950 congress provided an occasion for workers in the radiology industry to meet for the first time in over a decade and to discuss the direction future congresses should take. At the 1953 congress, under the guidance of Flemming Norgaard in Copenhagen the International Society of Radiology was set up to oversee the organisation of the International Congresses of Radiology rather than the ad hoc arrangement whereby the organisation of the next congress was left entirely in the hands of the host country. A permanent committee would also provide continuity between congresses. Norgard became the first secretary-general of the Society, while the radiologist from the sponsoring society who had been president of a congress was, by that token, president of the ISR until the next meeting. [7]
The sievert is a unit in the International System of Units (SI) intended to represent the stochastic health risk of ionizing radiation, which is defined as the probability of causing radiation-induced cancer and genetic damage. The sievert is important in dosimetry and radiation protection. It is named after Rolf Maximilian Sievert, a Swedish medical physicist renowned for work on radiation dose measurement and research into the biological effects of radiation.
Medical physics deals with the application of the concepts and methods of physics to the prevention, diagnosis and treatment of human diseases with a specific goal of improving human health and well-being. Since 2008, medical physics has been included as a health profession according to International Standard Classification of Occupation of the International Labour Organization.
The gray is the unit of ionizing radiation dose in the International System of Units (SI), defined as the absorption of one joule of radiation energy per kilogram of matter.
Radiation dosimetry in the fields of health physics and radiation protection is the measurement, calculation and assessment of the ionizing radiation dose absorbed by an object, usually the human body. This applies both internally, due to ingested or inhaled radioactive substances, or externally due to irradiation by sources of radiation.
Radiation protection, also known as radiological protection, is defined by the International Atomic Energy Agency (IAEA) as "The protection of people from harmful effects of exposure to ionizing radiation, and the means for achieving this". Exposure can be from a source of radiation external to the human body or due to internal irradiation caused by the ingestion of radioactive contamination.
Equivalent dose is a dose quantity H representing the stochastic health effects of low levels of ionizing radiation on the human body which represents the probability of radiation-induced cancer and genetic damage. It is derived from the physical quantity absorbed dose, but also takes into account the biological effectiveness of the radiation, which is dependent on the radiation type and energy. In the SI system of units, the unit of measure is the sievert (Sv).
Absorbed dose is a dose quantity which is the measure of the energy deposited in matter by ionizing radiation per unit mass. Absorbed dose is used in the calculation of dose uptake in living tissue in both radiation protection, and radiology. It is also used to directly compare the effect of radiation on inanimate matter such as in radiation hardening.
The rad is a unit of absorbed radiation dose, defined as 1 rad = 0.01 Gy = 0.01 J/kg. It was originally defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter. The material absorbing the radiation can be human tissue or silicon microchips or any other medium.
In dosimetry, linear energy transfer (LET) is the amount of energy that an ionizing particle transfers to the material traversed per unit distance. It describes the action of radiation into matter.
The International Commission on Radiological Protection (ICRP) is an independent, international, non-governmental organization, with the mission to protect people, animals, and the environment from the harmful effects of ionising radiation. Its recommendations form the basis of radiological protection policy, regulations, guidelines and practice worldwide.
The International Commission on Radiation Units and Measurements (ICRU) is a standardization body set up in 1925 by the International Congress of Radiology, originally as the X-Ray Unit Committee until 1950. Its objective "is to develop concepts, definitions and recommendations for the use of quantities and their units for ionizing radiation and its interaction with matter, in particular with respect to the biological effects induced by radiation".
Radiobiology is a field of clinical and basic medical sciences that involves the study of the action of ionizing radiation on living things, especially health effects of radiation. Ionizing radiation is generally harmful and potentially lethal to living things but can have health benefits in radiation therapy for the treatment of cancer and thyrotoxicosis. Its most common impact is the induction of cancer with a latent period of years or decades after exposure. High doses can cause visually dramatic radiation burns, and/or rapid fatality through acute radiation syndrome. Controlled doses are used for medical imaging and radiotherapy.
Internal dosimetry is the science and art of internal ionising radiation dose assessment due to radionuclides incorporated inside the human body.
The roentgen or röntgen is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air . In 1928, it was adopted as the first international measurement quantity for ionising radiation to be defined for radiation protection, as it was then the most easily replicated method of measuring air ionization by using ion chambers. It is named after the German physicist Wilhelm Röntgen, who discovered X-rays.
Computational human phantoms are models of the human body used in computerized analysis. Since the 1960s, the radiological science community has developed and applied these models for ionizing radiation dosimetry studies. These models have become increasingly accurate with respect to the internal structure of the human body.
Effective dose is a dose quantity in the International Commission on Radiological Protection (ICRP) system of radiological protection.
The committed dose in radiological protection is a measure of the stochastic health risk due to an intake of radioactive material into the human body. Stochastic in this context is defined as the probability of cancer induction and genetic damage, due to low levels of radiation. The SI unit of measure is the sievert.
The International Commission for Radiological Education (ICRE) was the third of the three commissions established in 1928 at the second International Congress of Radiology. It operates under the auspices of the International Congress of Radiology and is funded by the International Society for Radiology. The commission's mandate is to coordinate the activities of radiologists in the field of education and to investigate educational standards and facilities in all countries in respect of radiological subjects.
Madan M. Rehani is an Indian-born medical physicist.
Charles Thurstan Holland (1863–1941) was a general practitioner in Liverpool who was best known by his pioneering research in the field of Radiology. The Thurstan Holland sign is named after him.
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