CT掃描輻射 導致每年2.9萬宗癌症和過萬美國人死亡

來自CT掃描的輻射 導致每年2.9萬宗癌症和1.45萬美國人死亡
Radiation from CT scans causes 29,000 cancers a year, kills 14,500 Americans
Wednesday, April 21, 2010
by: David Gutierrez, staff writer

(NaturalNews) Computerized tomography (CT) medical scans cause at least 29,000 cases of cancer and 14,500 deaths in the United States every year, according to a study published in the Archives of Internal Medicine.
（NaturalNews）電腦斷層掃描（CT）的醫療掃描，造成每年在美國至少二萬九千宗癌症和1.45宗死亡，根據一項內科醫學檔案發表的研究。
Shocking as this figure is, a second study published in the same issue and conducted by researchers from the University of California-San Francisco suggests that the reality may actually be much worse.
正如這數字般令人震驚，一第二項研究發表在同一期和由來自三藩市加州大學的研究人員進行，提出現實可能實際上是更糟。
CT scans are diagnostic tests in which radiation is used to take a cross-sectional picture of a patient's organs. They have become far more common in the United States over the past 30 years, increasing in frequency from 3 million per year in 1980 to the current rate of 70 million per year.
CT掃描是診斷性測試，其中輻射是用來作出一病人器官的橫切面圖片，它們在過去 30年來在美國已變得遠遠更加普遍，使用率越來越多，從1980年時的一年300萬 次到目前的每年七千萬次速率。
In the first study, researchers from the National Cancer Institute used current estimates of CT scan radiation exposure to calculate the cancer risk produced by the procedure. They found that at current rates of use, the scans kill nearly 15,000 people a year, and cause twice as many cases of cancer. The risks vary by age, with younger patients at much higher risk because they have more time in which a cancer can develop.
在第一項研究中，從美國國家癌症研究所來的研究人員使用，目前的CT輻射掃描暴露估計去計算程序中所產生的癌症風險。他們發現，在目前的使用速率，掃描殺害近萬五人一年，並導致兩倍的癌症個案。風險根據年齡變化，年輕的患者有高得多的風險，因為他們有更多時間癌症可以發展。
The researchers estimated that a three-year-old female receiving an abdominal CT scan has a one in 500 risk of developing cancer as a direct result. The risk decreases to one in 1,000 by age 30 and three in 10,000 by age 70.

The University of California study suggests that these numbers are actually far too low, however. Current estimates of how much radiation exposure a patient receives from a given CT scan are based on old studies that scanned inanimate objects equipped with sensors. The new study actually measured the radiation dose received by 1,119 patients undergoing CT scans at four different hospitals in the San Francisco area.
但是加州大學的研究提出，這些數字實際上是太低。目前的估計，一個病人從CT掃描會接收多少輻射照射，是基於舊的研究，以設有的傳感器去掃描無生命的物體。這項新研究實際地量度了輻射劑量，由舊金山地區四間不同醫院的1,119名接受CT掃描的病人所接收。
The researchers found that actual radiation exposure was anywhere from four to 13 times higher than prior studies had suggested.
研究人員發現，實際的輻射照射是，較之前的研究曾提出的，在任何方面從 4至13倍。
Rosaleen Parsons of the Fox-Chase Cancer Center suggests that patients keep their medical records to avoid unnecessary repetition of tests, and ask their doctors about alternatives to radiation-based scans.

http://www.naturalnews.com/028621_CT_scans_cancer.html