Is Frequent CT Scanning After Liver Cancer Surgery Safe?
Excessive number of CT scans for liver cancer? Hello, doctor! My family member underwent surgery for liver cancer and has been scheduled for a CT scan every three months. Recently, due to fluctuating levels of alpha-fetoprotein, they have had two CT scans within a short period of...
Dr. Sun Shengyi reply Radiology
Hello: Generally, cancer patients undergo a CT scan two to three months after treatment to monitor for potential recurrence. This early detection allows for prompt intervention, alleviating concerns about excessive radiation exposure. Patients should prioritize monitoring for can...[Read More] Is Frequent CT Scanning After Liver Cancer Surgery Safe?
Managing Low-Dose CT Scans During Early Pregnancy: What to Know
Low-dose computed tomography for pregnant women? Hello, doctor. My wife's last menstrual period was on October 5th, and we had a health check-up scheduled for November 4th, which included a low-dose lung CT scan. After the health check-up in early November, we discovered tha...
Dr. Sun Shengyi reply Radiology
Hello Mr. Su: In early pregnancy, it is indeed important to minimize radiation exposure for the safety of the fetus. According to currently accepted international standards, a radiation dose below 50 mSv (millisieverts) is not expected to cause harm to the fetus. The radiation do...[Read More] Managing Low-Dose CT Scans During Early Pregnancy: What to Know
Understanding Radiation Exposure During CT Scans for Lipomas
Radiation Issues Hello Dr. Sun: Recently, I noticed a small bump near my shoulder, and a dermatologist diagnosed it as a lipoma. I was referred to a plastic surgeon, who recommended a CT scan. During the scan, I was instructed to inhale, hold my breath, and then exhale. I would l...
Dr. Sun Shengyi reply Radiology
Dear Mr. Peng: During chest or abdominal computed tomography (CT) scans, it is standard practice to ask patients to hold their breath to avoid any motion artifacts caused by breathing, which can lead to blurred images. Even slight movements of the shoulders due to breathing can...[Read More] Understanding Radiation Exposure During CT Scans for Lipomas
Understanding the Impact of X-rays on Children's Health: A Parent's Concern
Radiation Issues Hello Doctor, I would like to ask about my daughter, who is in the first grade. During the school health check-up, it was found that she has scoliosis. The school advised us to take her to a medical facility for further examination. We took her to an orthopedic...
Dr. Sun Shengyi reply Radiology
Hello Mr. Huang: Generally, the radiation dose from standard spinal X-rays (which typically consists of two images) does not exceed 1 millisievert (mSv). When the frequency of these X-rays is low (a few times within a year), this dose is not likely to cause any significant harm. ...[Read More] Understanding the Impact of X-rays on Children's Health: A Parent's Concern
Understanding Radiation Risks: X-rays and Bone Growth Concerns
Radiation issues Doctor, I apologize, but may I ask you one last question? I would like to schedule an appointment with you, but I cannot find your available consultation times. So, you mean that excessive X-ray radiation could potentially cause bone damage, but it will not reope...
Dr. Sun Shengyi reply Radiology
Under normal circumstances (unless for radiation therapy of known diseases), exposure to high doses of X-ray radiation that could cause skeletal damage is unlikely, and it will not affect closed growth plates. Therefore, there is no need for concern regarding this issue.[Read More] Understanding Radiation Risks: X-rays and Bone Growth Concerns
Understanding the Risks of Excessive X-Ray Radiation on Bone Health
Radiation issues? Hello Doctor, this is Hehe, the one who asked a question last time. Thank you for your response; I am no longer worried. However, I would like to follow up with a question. You mentioned that excessive X-ray radiation could potentially lead to changes in the bon...
Dr. Sun Shengyi reply Radiology
The most concerning harm caused by long-term high-dose radiation is indeed the induction of cancer. Different exposure durations and frequency intervals of radiation can affect various potential changes.[Read More] Understanding the Risks of Excessive X-Ray Radiation on Bone Health
Concerns About CT Scans in Young Children: Risks and Safety Explained
A one-year and two-month-old baby underwent a computed tomography (CT) scan? Dear Doctor, my baby is one year and two months old and fell from the bed. He did not lose consciousness. However, after a CT scan of the head, I learned that it is a radiation examination, which makes m...
Dr. Sun Shengyi reply Radiology
It is acceptable for a baby who has hit their head and is experiencing altered consciousness to undergo a head CT scan. The radiation dose from a head CT scan for infants is typically less than half that of adults, estimated to be around 1.0 millisievert (mSv), which is lower tha...[Read More] Concerns About CT Scans in Young Children: Risks and Safety Explained
Concerns About Radiation Exposure from X-rays and CT Scans
Radiation issues Hello, Doctor. I would like to express my apologies to the staff at Taiwan e-Hospital. I am very sorry for asking a similar question before, but due to my tendencies towards depression and anxiety, I still feel uneasy. If I still feel worried after this inquiry, ...
Dr. Sun Shengyi reply Radiology
Significant exposure to X-ray radiation can potentially cause changes in the bones, but it will not lead to further development of fully matured bones. Receiving over twenty X-ray exposures will not result in continued bone development, so there is no need for further concern reg...[Read More] Concerns About Radiation Exposure from X-rays and CT Scans
Is Frequent Chest X-Ray Safe? Understanding Risks and Concerns
X-ray and CT issues? Hello, Doctor: This year, I have frequently experienced chest pain, which has led me to visit the hospital often. I have undergone approximately 10 chest X-rays within a year, but each time the results have shown nothing significant. A month ago, I also had a...
Dr. Sun Shengyi reply Radiology
A standard chest X-ray is a low-radiation examination that is widely accepted and effective for diagnosing pulmonary conditions, with a radiation dose of approximately 0.02 millisieverts (mSv). In contrast, the radiation dose from a computed tomography (CT) scan is significantly ...[Read More] Is Frequent Chest X-Ray Safe? Understanding Risks and Concerns
Multiple Chest X-Rays: Weighing Risks and Benefits for Asthma Patients
Repeated X-ray imaging of the same area? The doctor would like to consult you regarding their personal history of asthma since childhood, which has led to multiple chest X-rays each year. In early October of this year, they experienced a prolonged cough and underwent two addition...
Dr. Sun Shengyi reply Radiology
The radiation dose from a standard chest X-ray is approximately 0.02 millisieverts (mSv), which is a very low dose and is widely accepted as the first-line imaging test for evaluating the lungs. Having several chest X-rays annually due to routine check-ups or medical needs does n...[Read More] Multiple Chest X-Rays: Weighing Risks and Benefits for Asthma Patients
Understanding Radiation Exposure from Multiple X-rays: Risks and Concerns
Radiation issues I have a question that has been bothering me for a long time. A year ago, I had an accident and underwent over 20 X-rays of my spine and knee within a month. At that time, I didn't consider the radiation exposure, and since I visited two different hospitals,...
Dr. Sun Shengyi reply Radiology
Ms. Yue: The radiation dose from a standard lumbar spine X-ray is indeed higher than that from other body parts, with the frontal and lateral views approximately 1.0-1.5 mSv (millisieverts); whereas the limbs are less than 0.1 mSv. Based on your condition, the total dose should n...[Read More] Understanding Radiation Exposure from Multiple X-rays: Risks and Concerns
Does Taking Accutane Affect Your Body During a CT Scan?
Computed Tomography (CT) Scan Will undergoing a CT scan affect my body since I have recently taken isotretinoin (Accutane)?
Dr. Sun Shengyi reply Radiology
Hello, Wen: The ultraviolet radiation associated with retinoic acid is different from the X-ray radiation from a CT scan, so undergoing a CT scan will not have any additional effects on the body due to the use of retinoic acid.[Read More] Does Taking Accutane Affect Your Body During a CT Scan?
Understanding the Risks of Multiple Chest X-Rays: What You Should Know
X-ray radiation dose Hello Doctor: This year, I have undergone approximately seven chest X-rays due to chest pain. Could you please let me know what effects or negative consequences this might have? I'm concerned that this could lead to any changes or complications. Thank yo...
Dr. Sun Shengyi reply Radiology
Hello Ted: The radiation dose from a standard chest X-ray is very low (approximately 0.02 millisieverts), which is why it is widely used as a basic health screening tool. Seven chest X-rays amount to about 0.14 millisieverts, and the potential harm to the body is negligible, so t...[Read More] Understanding the Risks of Multiple Chest X-Rays: What You Should Know
Understanding Radiation Risks: Pregnancy, MRI, and Leukemia Concerns
Radiation issues in examinations? Hello Dr. Sun, my sister-in-law had leukemia when she was young, and I am concerned about the potential hereditary risk. I am worried that radiation may increase the likelihood of my child developing leukemia. I have the following questions for y...
Dr. Sun Shengyi reply Radiology
Hello: 1. Magnetic resonance imaging (MRI) is safe for both pregnant women and fetuses, and it does not increase the risk of leukemia in the unborn child. 2. The radiation dose from low-dose computed tomography (CT) scans of the lungs is not sufficient to harm the ova; it is advi...[Read More] Understanding Radiation Risks: Pregnancy, MRI, and Leukemia Concerns
CT Scans During Early Pregnancy: Risks and Considerations
Abdominal CT scan during pregnancy? Dear Dr. Sun, I recently underwent a health check-up and, unbeknownst to me that I might be pregnant (six days after intercourse), the physician performed an abdominal ultrasound and suspected a renal tumor. They recommended a contrast-enhance...
Dr. Sun Shengyi reply Radiology
Abdominal ultrasound revealed a suspected renal tumor, and the next step in diagnosis is a contrast-enhanced abdominal computed tomography (CT) scan, which is the first choice for further evaluation. The urinary system examination should include both the abdomen and the pelvic ca...[Read More] CT Scans During Early Pregnancy: Risks and Considerations
Understanding MRI Contrast Agents: Safety and Kidney Health Concerns
Regarding magnetic resonance imaging (MRI) contrast agents? Dear Dr. Sun, I have two questions to ask you: 1. I have scheduled MRI scans for both my head and mediastinum, and both require the use of contrast agents. How long should I wait between the two scans to avoid putting ...
Dr. Sun Shengyi reply Radiology
MRI contrast agents pose minimal burden on normally functioning kidneys, except for unexpected and very rare allergic reactions. For safety reasons, repeated injections should be avoided to prevent excessive dosage. There is no specific safety standard for the interval between in...[Read More] Understanding MRI Contrast Agents: Safety and Kidney Health Concerns
Is MRI Safe for Infants with Breathing Difficulties?
Magnetic Resonance Imaging (MRI) The child is currently under 4 months old, and the doctor has scheduled an MRI for further examination. If the child experiences difficulty breathing while lying down (only sleeps on their side), frequently wakes up gasping for air, has tongue ret...
Dr. Sun Shengyi reply Radiology
Although magnetic resonance imaging (MRI) is safe for children and does not involve radiation exposure, the procedure requires the child to remain still for at least ten minutes, which may necessitate sedation or anesthesia. The lying position during the scan can be adjusted; if ...[Read More] Is MRI Safe for Infants with Breathing Difficulties?
Understanding Radiation Exposure from Head and Neck CT Scans and Cardiac Procedures
Does radiation dose to the head and neck cause harm to the body? 1. The radiation dose from a head and neck CT scan and cardiac catheterization with ablation (for tachycardia) within a year may pose some risk, but the extent of harm depends on the cumulative dose and individual s...
Dr. Sun Shengyi reply Radiology
The radiation dose from a single head and neck computed tomography (CT) scan is approximately 6 mSv (millisieverts). The scanning range and settings may vary depending on the focus of the examination. Regarding cardiac catheterization with radiofrequency ablation, the radiation e...[Read More] Understanding Radiation Exposure from Head and Neck CT Scans and Cardiac Procedures
Understanding Radiation Dose in Chest CT Scans: A Patient's Guide
Chest CT Radiation Dose Report Dear Dr. Sun, Thank you very much for your previous response regarding the dose report for my chest CT scan with contrast. The dose report is as follows: Dose Report Series Type Scan Range (mm) CTDlvol (mGy) DLP (mGy-cm) 1 Scout 59....
Dr. Sun Shengyi reply Radiology
According to the latest standards set by the International Commission on Radiological Protection, the conversion factor for chest computed tomography (CT) is 0.0145. Therefore, 511.82 (DLP) x 0.0145 = 7.42 mSv (millisieverts). This is slightly lower than the average exposure dose...[Read More] Understanding Radiation Dose in Chest CT Scans: A Patient's Guide
Understanding Radiation Dose in Chest CT Scans: What You Need to Know
Radiation Dose of Chest Computed Tomography (CT) Scan Hello Dr. Sun, I recently underwent a high-dose chest CT scan (with contrast injection), and the results showed no issues with my lungs. After the examination, I researched online and learned that this type of scan can be harm...
Dr. Sun Shengyi reply Radiology
Chest computed tomography (CT) scans have different scanning parameters based on clinical needs, including low-dose scans for tumor screening and standard scans (with or without contrast agent injection). The radiation dose for a standard chest CT scan with contrast may range fro...[Read More] Understanding Radiation Dose in Chest CT Scans: What You Need to Know