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:
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:
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
Understanding X-Ray Radiation Risks in Children: What Parents Should Know
Childhood X-ray radiation concerns? Hello Dr. Yeh, 1. When my child was nearly 1 year old, he was diagnosed with laryngomalacia, and the doctor recommended a "neck and head X-ray." Initially, the father held the baby for the X-ray, but the baby was scared and cried con...
Dr. Ye Weicheng Reply:
When performing X-ray imaging of the head and neck in infants and young children, radiologic technologists generally reduce the radiation dose significantly due to the incomplete development of their tissues. Of course, advancements in technology have led to the incorporation of ...[Read More] Understanding X-Ray Radiation Risks in Children: What Parents Should Know
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:
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 the Risks of Multiple X-Rays: Health Impacts and Concerns
The harm of X-rays? How much harm does it cause to the body to have two X-rays within six months? In March 2012, due to an additional nerve conduction line in the heart, I underwent catheter ablation. What was the approximate radiation dose for that procedure? In August of the sa...
Dr. Zhang Zheng'ang Reply:
Hello, the radiation dose from catheter ablation is approximately 15 millisieverts per procedure. The radiation dose from a CT scan of the head and neck varies depending on the scan area, the number of scans (if contrast is injected, it typically requires two scans), and the type...[Read More] Understanding the Risks of Multiple X-Rays: Health Impacts and Concerns
Understanding Radiation Exposure: Risks and Measurements in Medical Procedures
Radiation dose The radiation dose from cardiac catheterization with ablation in 2012 varies based on the specific procedure and equipment used, but it typically ranges from 5 to 30 millisieverts (mSv). The radiation dose for a neck and head CT scan in the same year is generally a...
Dr. Ye Weicheng Reply:
Ans1: Cardiac catheterization is a procedure that involves fluoroscopic imaging, and the radiation dose does not have a fixed value; it depends on the duration of radiation exposure at the time. Typically, the dose ranges from 7 to 15 millisieverts, but if the physician's pr...[Read More] Understanding Radiation Exposure: Risks and Measurements in Medical Procedures
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:
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:
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
Is Frequent Chest X-Ray Exposure Safe? Understanding Radiation Risks
Concerns Regarding Radiation Exposure from Repeated Chest X-rays Last week, I went to the pulmonology department for a chest X-ray due to a cough that lasted over two weeks from a cold. This week, my company health check also requires a chest X-ray. Is it too close in time to hav...
Dr. Zhang Zheng'ang Reply:
Hello, the radiation dose received from a single chest X-ray is not high. Even if you have two chest X-rays within a week, the radiation dose remains within an acceptable range, so there is no need to worry excessively. Whether it is necessary to have two X-rays in a short period...[Read More] Is Frequent Chest X-Ray Exposure Safe? Understanding Radiation Risks
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:
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:
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
Safety Concerns of Metal Dental Implants During MRI Scans
MRI Metal Issues Hello, doctor. Due to temporomandibular joint (TMJ) dysfunction, my doctor has arranged for me to undergo an MRI for further examination. I would like to ask if there are any safety concerns regarding the metal posts that were placed in the crowns of three teeth ...
Dr. Ye Weicheng Reply:
Metal dental implants do not pose safety concerns when entering an MRI room, so there is no need to worry. As for whether they will affect the examination results, generally they do not, unless the area being examined coincides with the location of the dental implant.[Read More] Safety Concerns of Metal Dental Implants During MRI Scans
Understanding Radiation Risks from Frequent CT Scans: What You Need to Know
Radiation Issues with Computed Tomography (CT) Scans Hello, Doctor. In September 2018, I was diagnosed with a salivary gland tumor, and I underwent a CT scan of the head and neck with contrast, as well as a chest X-ray, in preparation for surgery. Later, in December 2018, another...
Dr. Ye Weicheng Reply:
The harmful effects of ionizing radiation on human health are divided into deterministic effects and stochastic effects. Deterministic effects refer to harmful tissue responses resulting from exposure to excessive radiation; as the dose increases, the severity of the damage also ...[Read More] Understanding Radiation Risks from Frequent CT Scans: What You Need to Know
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:
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:
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:
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:
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:
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:
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:
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?
Radiology FAQ
| Contrast Agent | Ct Scan |
| Ct Scan Radiation | Magnetic Resonance Imaging |
| Mri | Mri Report |
| Radiation | Radiological Examination |
| X-Ray | X-Ray Examination |
| X-Ray Radiation |