Understanding X-Ray Safety for Veterinarians: Daily Limits and Protection
Entering the X-ray room with animals? Hello, Doctor. Due to my work, I often accompany animals into the X-ray room for imaging, and sometimes I take up to 8 images in a day. How many images can I safely take in one day? The X-ray settings include kV (commonly set between 50-150),...
Dr. Wang Yifen reply Radiology
Hello, in Taiwan, operations involving ionizing radiation must comply with the "Ionizing Radiation Protection Act," which aims to reasonably minimize radiation exposure to protect health and safety. The competent authority is the Atomic Energy Council of the Executive Y...[Read More] Understanding X-Ray Safety for Veterinarians: Daily Limits and Protection
Concerns About Radiation Exposure and Weight Loss: What You Need to Know
Radiation Issues Hello Doctor, due to autonomic nervous system dysfunction, I underwent the following examinations in 2018 and 2019: head CT scan, head MRI, chest X-rays (about 10 times), abdominal CT scan, neck ultrasound, echocardiogram, breast ultrasound, gastroscopy, abdomina...
Dr. Wang Yifen reply Radiology
Hello: According to the information from the American Society of Radiologic Technologists, the radiation dose for a head CT scan is approximately 2 millisieverts (mSv), 10 chest X-rays (both frontal and lateral views) is about 1 mSv, an abdominal CT scan is around 8 mSv, and an a...[Read More] Concerns About Radiation Exposure and Weight Loss: What You Need to Know
Understanding Radiation Exposure from X-rays and CT Scans
Radiation Issues I visited the orthopedic department due to groin pain and a suspected mass. I had four X-ray images of the hip and pelvis taken, and after the physician reviewed them, he determined that it was not a bone issue and referred me to the surgical department. The surg...
Dr. Wang Yifen reply Radiology
Hello: According to information from the American Society of Radiologic Technologists, the radiation dose from four pelvic X-rays is approximately 2.4 millisieverts, while the radiation dose from a CT scan of the abdomen and pelvis is about 14 millisieverts. The total radiation d...[Read More] Understanding Radiation Exposure from X-rays and CT Scans
How Small of a Lesion Can a Brain MRI Detect?
How small of a lesion can be detected on a brain MRI? Hello, doctor. I previously experienced prolonged dizziness (which has since resolved on its own), and I was concerned that there might be something wrong in my brain. Therefore, I went to Mackay Memorial Hospital's healt...
Dr. Wang Yifen reply Radiology
Hello, the size of the lesions observed in brain MRI scans is related to the strength of the magnetic field of the machine, the thickness of the images during scanning, and various parameters. If a contrast agent is administered, it will also depend on the concentration and dosag...[Read More] How Small of a Lesion Can a Brain MRI Detect?
Impact of Regular Chest X-rays on Employee Health and Fertility
X-rays and Employee Health Hello, doctor. Due to work requirements, our company mandates that employees undergo chest X-ray examinations every six months as per the contract. Since our employees are primarily unmarried young individuals and middle-aged groups, we are concerned ab...
Dr. Wang Yifen reply Radiology
Hello, a chest X-ray involves low-dose radiation. According to the data published by the Atomic Energy Council of the Executive Yuan, the radiation dose from a chest X-ray is approximately 0.02 millisieverts, which is lower than the 0.09 millisieverts of radiation exposure from a...[Read More] Impact of Regular Chest X-rays on Employee Health and Fertility
Radiation Exposure Risks from CT Scans in Young Children: What Parents Should Know
Radiation from CT scans in 5-year-old children? Dear Dr. Wang, My child is 5 years old. Earlier this year, he had an X-ray of his arm at a clinic, where he was not wearing a lead apron and other body parts were not shielded. I would like to know if full exposure to X-rays could ...
Dr. Wang Yifen reply Radiology
Hello, currently the estimation of X-ray risks is calculated based on adults. For children, since their organs are still developing and their lifespan is much longer, the risk of radiation-induced cancer may not be accurate, and therefore no data is available for reference. Howev...[Read More] Radiation Exposure Risks from CT Scans in Young Children: What Parents Should Know
Understanding Radiation Exposure from CT Scans and Heart Procedures
Dose of Computed Tomography for Head and Neck Hello doctor, I underwent cardiac catheter ablation for the cardiac conduction pathways in March 2012, which lasted approximately 6 hours. In July of the same year, I had a CT scan of the head and neck. Could you please tell me the ra...
Dr. Wang Yifen reply Radiology
Hello, according to the information from the American Society of Radiologic Technologists, the radiation dose from a single cardiac catheter ablation is approximately 15 millisieverts, while a single CT scan of the head and neck has a radiation dose of about 6 millisieverts, tota...[Read More] Understanding Radiation Exposure from CT Scans and Heart Procedures
Concerns About Radiation from Multiple Full Mouth X-rays and 3D CT Scans
Concerns regarding full-mouth X-rays and 3D full-mouth computed tomography (CT)? Hello, doctor. I have had two full-mouth X-rays and two out-of-pocket 3D cone beam computed tomography scans within three days. Should I be concerned about radiation exposure? Thank you for your resp...
Dr. Wang Yifen reply Radiology
Hello, according to the American Society of Radiologic Technologists, the radiation dose from two full-mouth X-rays is approximately 0.02 millisieverts, while the dose from two full-mouth CT scans is about 0.4 millisieverts, totaling approximately 0.42 millisieverts. The Internat...[Read More] Concerns About Radiation from Multiple Full Mouth X-rays and 3D CT Scans
Radiopharmaceuticals and Pregnancy: Safety Concerns for Healthcare Workers
Radiopharmaceuticals and Pregnancy Hello, Director Wang. I am a newcomer about to enter this field and am preparing for pregnancy. However, my job requires me to administer medications containing radioactive elements to patients. Since patients release radiation after receiving t...
Dr. Wang Yifen reply Radiology
Hello, radiation exposure can be categorized into two types: external exposure and internal exposure. External exposure refers to the exposure of the body to ionizing radiation from outside sources. To reduce the radiation dose from external exposure, one can shorten the exposure...[Read More] Radiopharmaceuticals and Pregnancy: Safety Concerns for Healthcare Workers
Assessing Radiation Exposure from Recent Medical Imaging Procedures
Radiation issues During a health check-up, a shadow was found in the lungs. In mid-February, follow-up X-rays (both frontal and lateral views) were taken, along with a non-contrast CT scan of the lungs (which took about 20 to 30 minutes). At the end of February, a contrast-enhanc...
Dr. Wang Yifen reply Radiology
1. According to the American Society of Radiologic Technologists, the radiation dose from a frontal and lateral X-ray is approximately 0.1 millisieverts, while two chest CT scans can amount to about 14 millisieverts, a full-body PET scan delivers around 14.1 millisieverts, and an...[Read More] Assessing Radiation Exposure from Recent Medical Imaging Procedures
Is Your CT Scan Radiation Exposure Exceeding Safe Limits?
Computed Tomography Radiation Hello, doctor. In September 2018, I was diagnosed with a salivary gland tumor and underwent a CT scan of the head and neck with contrast, as well as a chest X-ray, in preparation for surgery. On December 31, 2018, I had another CT scan of the head an...
Dr. Wang Yifen reply Radiology
Hello, according to the information from the American Society of Radiologic Technologists, the radiation dose for a single CT scan of the head and neck is approximately 8 millisieverts, and the total dose for three scans is about 24 millisieverts. A single chest X-ray (both front...[Read More] Is Your CT Scan Radiation Exposure Exceeding Safe Limits?
Is a Standard Abdominal MRI Enough to Check for Pancreatic Issues?
Magnetic Resonance Imaging (MRI) of the pancreas? Hello Dr. Wang, I would like to ask if a general abdominal MRI is sufficient to check for any abnormalities in the pancreas during a health examination (without needing to differentiate between benign and malignant tumors), or i...
Dr. Wang Yifen reply Radiology
Hello, the injection of contrast agents (contrast media) can enhance the detection and assessment of diseases. It is also possible to choose not to administer a contrast agent; however, for specific conditions, especially tumors, this may reduce the diagnostic value and accuracy ...[Read More] Is a Standard Abdominal MRI Enough to Check for Pancreatic Issues?
Impact of Metal Dental Work on Brain MRI Imaging Results
When undergoing a brain MRI, there may be concerns regarding metal in the teeth? Hello doctor, last week I had a brain MRI. After I returned, I suddenly remembered that I have a fixed dental crown on my upper left tooth (with a ceramic outer layer and a metal inner layer) and ano...
Dr. Wang Yifen reply Radiology
Hello, the MRI images of the oral region may be affected by the metal from dentures, resulting in image artifacts, while the rest of the brain is not significantly impacted. Additionally, the scanning parameters of the equipment can be adjusted during the examination to improve i...[Read More] Impact of Metal Dental Work on Brain MRI Imaging Results
Differences Between MSCT and LDCT for Lung Health Screening
The difference between MSCT (Multi-Slice Computed Tomography) and LDCT (Low-Dose Computed Tomography)? Hello Dr. Wang, I hope you don't mind me asking. My wife is considering undergoing a health check-up, and the hospital's equipment for the low-dose lung CT scan is adv...
Dr. Wang Yifen reply Radiology
Hello, MSCT stands for multi-slice computed tomography, while LDCT stands for low-dose computed tomography. MSCT refers to the type of machine, with models available ranging from 4-slice to 640-slice computed tomography. LDCT indicates that the examination is conducted using a lo...[Read More] Differences Between MSCT and LDCT for Lung Health Screening
Can We Measure Radiation Exposure in the Human Body?
Is it possible to measure the amount of radiation exposure in the human body? Hello Director Wang, about six months ago, I was potentially exposed to approximately 30 seconds of radiation due to a colleague's improper use of a handheld XRF (X-ray fluorescence) metal element ...
Dr. Wang Yifen reply Radiology
Hello, radiation is a form of energy. Currently known radiation detection methods cannot measure the radiation levels at the time of exposure after the exposure has occurred, similar to sunbathing; sunlight does not remain on the skin, and after sun exposure, one cannot calculate...[Read More] Can We Measure Radiation Exposure in the Human Body?
Understanding Radiation Risks from Chest CT Scans and Cancer Concerns
Chest Computed Tomography Radiation Hello, I had a low-dose chest CT scan during my health check-up in early May this year due to a lung nodule. My doctor has scheduled another chest CT scan with contrast for follow-up at the end of December, which will not be low-dose. Additiona...
Dr. Wang Yifen reply Radiology
Hello, 1. According to the data from the American Society of Radiologic Technologists, the risk of developing additional cancer from a single low-dose chest CT scan is 0.010114%, while the risk from a standard chest CT scan is 0.035398%. The combined radiation dose from both sc...[Read More] Understanding Radiation Risks from Chest CT Scans and Cancer Concerns
Understanding CT Scans: Do They Include Head and Neck Areas?
Examination site Hello doctor, six months ago I underwent a CT scan due to a salivary gland tumor. I remember the machine scanned back and forth between my head and neck. I would like to ask if this means that my head was also included in the scan?
Dr. Wang Yifen reply Radiology
Hello: The head at the same level as the parotid gland will be within the scanning range. Wishing you peace and health.[Read More] Understanding CT Scans: Do They Include Head and Neck Areas?
Understanding Radiation Dose and Distance in Dental X-rays: Key Concerns
Questions about radiation dose and distance? I have read articles on E-net regarding similar issues, but the answers did not alleviate my concerns, so I am asking again to see if there are clearer answers. I have seen articles elsewhere mentioning that radiation dose is related t...
Dr. Wang Yifen reply Radiology
Hello: 1. Regarding the placement of X-rays in a full-mouth X-ray machine: X-rays are produced when the X-ray tube is energized, releasing energy that is converted into X-rays due to the high-voltage electric field. Therefore, X-rays are emitted from the X-ray tube of the machi...[Read More] Understanding Radiation Dose and Distance in Dental X-rays: Key Concerns
Understanding Uterine Artery Embolization: Risks and Recovery Insights
Questions related to uterine artery embolization? Dear Dr. Wang, I underwent a uterine surgery earlier this year, but experienced severe postoperative hemorrhaging. The hospital urgently performed a 4-hour uterine artery embolization procedure to control the bleeding. I have a f...
Dr. Wang Yifen reply Radiology
Hello, 1. The radiation exposure dose during uterine artery embolization can vary depending on the patient's body type and the duration of radiation exposure. Literature (Acta Radiol. 2006 Mar;47(2):179-85) reports an average dose of approximately 32 millisieverts. The pur...[Read More] Understanding Uterine Artery Embolization: Risks and Recovery Insights
Understanding Radiation Exposure from Frequent X-rays and CT Scans
I have health anxiety, so I had many X-rays taken this year, raising concerns about radiation exposure? I have health anxiety, so I often worry that I have something harmful in my body. Due to concerns about radiation causing cancer, I would like a doctor to evaluate whether my e...
Dr. Wang Yifen reply Radiology
Hello, regarding the estimation of radiation doses and risks, you can refer to the American Society of Radiologic Technologists website at http://www.xrayrisk.com/calculator/calculator.php. According to the data from that site, the radiation dose for a head and neck CT scan is ap...[Read More] Understanding Radiation Exposure from Frequent X-rays and CT Scans