Understanding X-Ray Radiation Exposure: Risks and Long-Term Effects
X-ray radiation dose I would like to ask the doctor: What is the approximate radiation dose from an abdominal X-ray? Between my twenties and thirties, I underwent more than ten chest X-rays and more than ten abdominal X-rays due to health check-ups and illnesses, as well as one r...
Dr. Sun Shengyi reply Radiology
The radiation dose from an abdominal X-ray is approximately 0.4-0.6 mSv (millisieverts), while a chest X-ray is only about 0.02 mSv. Myocardial perfusion scans are related to the duration that the isotopes remain in the body (which is only a few days), and their long-term effects...[Read More] Understanding X-Ray Radiation Exposure: Risks and Long-Term Effects
Understanding CT Scans: Radiation Risks and Safety for Patients
CT scan of the head Hello doctor, my mom fell off her bicycle this week and hit her head. The doctor performed a CT scan and said everything is fine. However, I would like to ask if my mom, who underwent radiation therapy two years ago, is at risk of excessive radiation exposure ...
Dr. Sun Shengyi reply Radiology
The radiation dose from a single head computed tomography (CT) scan is approximately 2.0 mSv (millisieverts), which is less than one-thousandth of the high doses used in typical radiation therapy. Therefore, the potential harm to a normal human body is minimal, and there is no ne...[Read More] Understanding CT Scans: Radiation Risks and Safety for Patients
Impact of 20 X-rays in Six Months: Health Risks and Leukemia Concerns
The impact of undergoing 20 X-rays in six months on the body? In September of this year, I underwent a small bowel barium X-ray due to persistent lower abdominal issues, which involved taking about a dozen images. Then, in mid-November, I had a urinary tract X-ray with contrast d...
Dr. Sun Shengyi reply Radiology
A standard X-ray exposure is approximately 0.02-0.5 mSv (millisieverts). To cause direct harm to the body, the exposure would need to be at least 100 mSv or more. The potential increase in the risk of leukemia is also extremely low, so there is no need to worry about the possible...[Read More] Impact of 20 X-rays in Six Months: Health Risks and Leukemia Concerns
Accuracy of Gallium-67 Scans for Diagnosing Colorectal Cancer
Gallium-67 scanning Hello, doctor. Is the accuracy of Gallium-67 whole-body scanning high for diagnosing colorectal cancer? Can it detect polyps? Thank you. (I have had a low-grade fever for nearly a year, and the Gallium-67 scan is scheduled for January next year. Recently, I ha...
Dr. Sun Shengyi reply Radiology
Gallium-67 whole-body scans are not used to diagnose colorectal cancer, nor are they used to evaluate polyps. They are typically employed to investigate potential inflammatory lesions in the body due to prolonged unexplained fever. If there are concerns regarding colorectal tumor...[Read More] Accuracy of Gallium-67 Scans for Diagnosing Colorectal Cancer
Understanding Radiation Levels in FREEdom CT750 Scans: A Comparison
Computed Tomography (CT) Scan Hello, doctor. Previously, I inquired about the radiation dose of a standard CT scan, which is approximately 8 mSv for the abdomen and about 2 mSv for the head and neck. I heard that a certain hospital uses the FREEdom CT750, which reportedly has a l...
Dr. Sun Shengyi reply Radiology
The company's CT product (Discovery CT750 HD FREEdom Edition) utilizes a special technology called ASiR* (Adaptive Statistical Iterative Reconstruction) that maintains image quality while using a lower dose. It is claimed that this technology can reduce the dose by up to 50%...[Read More] Understanding Radiation Levels in FREEdom CT750 Scans: A Comparison