美國加州放射科葉中治醫師表示: MRI(核磁共振)沒有輻射; CT(電腦斷層掃描)是X光輻射; PET(正子癌細胞掃描) 具有來自同位素的輻射; PET / CT僅用作有疑似癌症因子時追踪之用。
葉醫生建議，所有五十歲以上女性，應注意下列信息：
1. 每2年做一次乳房X光檢查，X光輻射有乳癌風險; 如果需要進一步的檢驗，可以使用MRI或超聲波掃描，無輻射。
2. 胸部X光、實驗室檢驗、大腸鏡檢查和子宮頸抹片檢查，每2年進行一次。
3. 建議每2-3年進行一次腹部和骨盆超聲檢查，快速簡單而無輻射。
4. 診斷檢查暴露的輻射量相較於罹患疾病的風險不需過度在意，不應因噎廢食。
5. 在陽光下四個小時或搭機飛越美國大陸，每個人的身體所吸收的宇宙r射線與照胸腔X光所接受到的輻射量不相上下，不需過度擔心。
這也就是為什麼航空公司的飛行工作人員每週工作不超過40小時，因為這樣身體才能對輻射造成的損壞進行修復。
What should 50+ females know about medical test radiation?
By Anthony F Yipp MD
According to Dr Anthony F Yipp, a Radiologist, MRI has no radiation. PET has radiation from isotopes. CT is X-Ray radiation. PET/CT is used only as secondary for cancer tracing..
Also as some info for all females over age50:
1.Mammogram every 2 years. Nominal radiation with benefit verses risk of breast cancer. If need further follow up test, can use MRI or Ultrasound scan, No radiation.
2.Chest X-Ray, Lab test, Colonoscope screening and Pap smear every 2 years with physical examination.
3.Ultrasound screening test for Abdomen and Pelvis once every 2-3 years is recommended. Fast. simple and no radiation.
4.Radiation from diagnostic exam is neglectable compare to risk and benefit.
5.Four hours under the sun or a flight from coast to coast your body absorb as much X-Ray radiation (as cosmic r-ray) as from taking a chest X-Ray
That is why the airline flight workers only work 40 hours a week, for the body able make repair from radiation damage.