Levin Victor, Tatsuzaki Hideo
Section of Applied Radiation Biology and Radiotherapy, Division of Human Health, Department of Nuclear Sciences and Applications, International Atomic Energy Agency (IAEA), Wagramer Strasse 5, P.O. Box 200, A-1400, Vienna, Austria.
Radiother Oncol. 2002 May;63(2):147-50. doi: 10.1016/s0167-8140(02)00010-5.
The acquisition of radiotherapy by countries in transition (CITs) is an evolutionary process from having no resources whatsoever, to meeting the standards adopted by well-developed countries. The influence of the economic ability of a country to acquire and sustain this technology has intuitively been accepted as a major factor but has not before been subjected to analysis for a large group of countries. This information has been analysed to provide guidance to countries commencing and expanding radiotherapy services.
The number of linear accelerators and (60)Co megavoltage teletherapy machines in 72 CITs, those with gross national income per capita (GNI/cap)<$12000 per annum (pa) and a sample of 12 countries with GNI/cap>$12000 pa were expressed as machines per million population (MEV/mil) and used as an index of the ability of the country to provide a service. This figure was related to GNI/cap. The average populations of 24 further countries without radiotherapy were compared with 21 countries with radiotherapy facilities having the same range of GNI/cap.
The relationship log(10) MEV/mil=-2.90+0.85 log(10) GNI/cap was identified between the machines and income. Also verified was that small low income countries were less likely to have the technology than those with large populations.
The increase in the number of teletherapy machines is closely linked to the GNI/cap of a country. Our sample of well developed countries failed to demonstrate a levelling off of equipment acquisition with income. In the lower income group, smaller countries were less likely to have radiotherapy services than those with large populations.
经济转型国家（CITs）获取放射治疗技术是一个从毫无资源到达到发达国家所采用标准的演进过程。直观上，一个国家获取并维持这项技术的经济能力的影响被视为一个主要因素，但此前尚未针对大量国家进行分析。已对该信息进行分析，以为开始和扩大放射治疗服务的国家提供指导。
72个经济转型国家、人均国民总收入（GNI/cap）低于每年12000美元的国家以及12个人均国民总收入高于每年12000美元的国家样本中的直线加速器和钴 - 60兆伏远距离治疗机数量，以每百万人口的机器数（MEV/mil）表示，并用作该国提供服务能力的指标。该数字与人均国民总收入相关。将另外24个没有放射治疗的国家的平均人口与21个具有相同人均国民总收入范围且有放射治疗设施的国家进行比较。
确定了机器数量与收入之间的关系log(10) MEV/mil = -2.90 + 0.85 log(10) GNI/cap。还证实，低收入小国比人口众多的国家拥有该技术的可能性更小。
远距离治疗机数量的增加与一个国家的人均国民总收入密切相关。我们的发达国家样本未能证明设备购置随收入趋于平稳。在低收入群体中，小国比人口众多的国家提供放射治疗服务的可能性更小。
