Managing Pregnancy After Low-Dose Lung CT: Health and Fertility Tips
Low-Dose Computed Tomography of the Lungs and Pregnancy A young woman underwent a low-dose computed tomography (CT) scan of the lungs before marriage and discovered a nodule. The doctor recommended low-dose follow-up scans every six months. How should she manage the issues relate...
Dr. Wang Yifen Reply:
Hello, if you are pregnant, please discuss the necessity of the X-ray examination with your physician before the procedure, evaluate whether there are alternative examinations available, and take appropriate precautions. Generally, the radiation dose from a low-dose chest CT scan...[Read More] Managing Pregnancy After Low-Dose Lung CT: Health and Fertility Tips
Is Too Much Radiation from Multiple CT Scans Dangerous?
Computed Tomography (CT) Scan Hello, doctor. In the past few months, I have undergone an abdominal CT, a neck CT, a swallowing study, a barium swallow study, and several X-rays. Now, I have another brain CT scheduled. Is this too much radiation exposure?
Dr. Wang Yifen Reply:
Hello, the purpose of radiation-related examinations is to provide medical imaging information, ensuring that the medical benefits to the patient far outweigh the risks associated with radiation, following the principle of justification. There are no restrictions on the number, d...[Read More] Is Too Much Radiation from Multiple CT Scans Dangerous?
Assessing Radiation Exposure Risks from Repeated Imaging Exams in Taiwan
Risk assessment for repeated imaging examinations this year? Hello Doctor: When I was young, I frequently underwent full spine X-ray examinations due to scoliosis, approximately 40 times between the ages of 1 and 20. Two years ago and four years ago, I had surgery for sinusitis, ...
Dr. Wang Yifen Reply:
According to information from the American Society of Radiologic Technologists, the radiation dose from a single head CT scan is approximately 2 millisieverts (mSv), while a single abdominal and pelvic CT scan has a radiation dose of about 14 mSv. A Gallium scan, which is a nucle...[Read More] Assessing Radiation Exposure Risks from Repeated Imaging Exams in Taiwan
Is It Safe to Undergo Multiple CT Scans in a Short Time?
CT scan interval issues I would like to ask about the interval between tests. I had a Myocardial Perfusion Scan on September 1, which is a nuclear medicine test, and then I had a whole-body CT scan on September 16. Should I avoid any X-rays or CT scans in the short term to minimi...
Dr. Wang Yifen Reply:
Hello, the purpose of radiation-related examinations is to provide medical imaging information, assessing that the medical benefits to the patient far outweigh the risks associated with radiation, which justifies the procedure. There are no restrictions on the number, dosage, or ...[Read More] Is It Safe to Undergo Multiple CT Scans in a Short Time?
Understanding Contrast Agent Side Effects: When to Seek Medical Attention
Side effects of contrast agents? Hello, I would like to inquire on behalf of my father. He had a CT scan at the hospital about three weeks ago, and now the blood vessel at the injection site (arm) feels hard and painful to the touch. It has been three weeks and there has been no ...
Dr. Wang Yifen Reply:
Hello, the phenomenon you described will not occur in blood vessels that have been injected with iodine-based contrast agents. It is recommended that your father visit the original treating department, a cardiology clinic, or a family medicine clinic for further evaluation and ma...[Read More] Understanding Contrast Agent Side Effects: When to Seek Medical Attention
CT Scans for Newborns: Safety Concerns and Alternatives Explained
Computed Tomography for Newborns The baby is one week old and suspected to have a spinal defect. An ultrasound was performed, but the doctor indicated that the images were unclear and recommended an MRI. However, after the baby was given sedatives, they still woke up, and the doc...
Dr. Ye Weicheng Reply:
Please refer to the attached information. Director Yeh Wei-Cheng, Department of Radiology, Nantou Hospital.[Read More] CT Scans for Newborns: Safety Concerns and Alternatives Explained
Understanding Radiation Exposure from Your Recent CT Scan: Risks and Measurements
CT Scan Report Radiation The CT report you received includes several measurements related to radiation exposure during your abdominal CT scan with contrast. The values provided are as follows: - CTDIvol (Computed Tomography Dose Index volume): 14.00 mGy (Body) - DLP (Dose Length...
Dr. Wang Yifen Reply:
Hello, Professor Tsai Hui-Yu and colleagues have pointed out in their literature that the reference dose levels for computed tomography (CT) recommended in the EU report 16262 for general abdominal examinations have a DLP of 780 (mGy·cm). Your report shows a value of 449.2, which...[Read More] Understanding Radiation Exposure from Your Recent CT Scan: Risks and Measurements
Understanding CT Scan Radiation Risks and Cancer Concerns
Computed Tomography Radiation I apologize for the concern regarding your mother's recent abdominal CT scan, which included imaging of the chest and the use of contrast agents. Given her family history of breast cancer with two sisters affected, you are understandably worried...
Dr. Wang Yifen Reply:
Hello, breast cancer is the most common cancer among women in our country. The peak incidence occurs in women aged 45-69. The National Health Service provides biennial mammography screenings for women aged 45-69 and for those aged 40-44 with a family history of breast cancer (def...[Read More] Understanding CT Scan Radiation Risks and Cancer Concerns
Understanding Annual Radiation Dose Limits: What You Need to Know
What is the maximum annual radiation dose limit? Hello, doctor. I have one more question to ask; I have seen many Q&As in this section, and doctors often mention, "According to the International Commission on Radiological Protection (ICRP) Report 103, a dose below 100 mi...
Dr. Wang Yifen Reply:
According to the International Commission on Radiological Protection's Report No. 60, when a person is exposed to a radiation dose of 100 millisieverts, their risk of developing cancer increases by 0.24% compared to someone who has not been exposed. This means that if 100,00...[Read More] Understanding Annual Radiation Dose Limits: What You Need to Know
Understanding MRI Findings of Liver Nodules in Cancer Survivors
MRI of the liver shows nodules? Hello, doctor. My mother is 60 years old. She was diagnosed with stage 1A gastric cancer in August 2018 and underwent surgical treatment. Since then, she has been undergoing annual check-ups. In July 2020, an abdominal CT scan revealed a small nodu...
Dr. Wang Yifen Reply:
Hello, your mother has a history of gastric cancer and requires regular follow-up. The imaging report consists of a written description, and the diagnosis and treatment of the disease should be based on a comprehensive analysis of the actual imaging and relevant clinical data to ...[Read More] Understanding MRI Findings of Liver Nodules in Cancer Survivors
Concerns About Radiation Exposure from Dental X-rays and CT Scans
Upper abdominal contrast-enhanced computed tomography (CT) scan with dental X-ray? Hello, I am 19 years old and female. I would like to ask if the dental X-rays I had done last year in November (two times) and the abdominal CT scan with contrast in early April of this year, follo...
Dr. Zhang Zheng'ang Reply:
Hello, Ms. Cheng! Due to medical necessity, undergoing X-rays and CT scans is more beneficial than harmful, and there is no need to consider whether it increases the risk of cancer.[Read More] Concerns About Radiation Exposure from Dental X-rays and CT Scans
Understanding Radiation Risks from CT and PET Scans: Your Questions Answered
I would like to inquire about the radiation concerns related to computed tomography (CT) scans and positron emission tomography (PET) scans. Thank you? Hello, Director. I would like to ask you about my mother. She underwent a chest CT scan with contrast on April 5th of this year,...
Dr. Wang Yifen Reply:
According to information from the American Society of Radiologic Technologists, the radiation dose for a single cardiac CT scan is approximately 16 millisieverts, while a low-dose lung CT scan is about 2 millisieverts. A full-body positron emission tomography (PET) scan has a rad...[Read More] Understanding Radiation Risks from CT and PET Scans: Your Questions Answered
Is CT Scan Radiation Safe After Multiple X-Rays for Injury?
Computed Tomography Radiation Hello, I previously had a fracture in my foot and underwent several X-rays. Recently, I have been experiencing autonomic nervous system dysfunction, which has led me to consider getting a health check-up. Would the combination of this and a CT scan r...
Dr. Wang Yifen Reply:
Hello, these X-ray examinations involve safe levels of radiation exposure. According to the International Commission on Radiological Protection (ICRP) report 103, doses below 100 millisieverts (including single or multiple exposures) do not cause clinical functional impairment. F...[Read More] Is CT Scan Radiation Safe After Multiple X-Rays for Injury?
Understanding Radiation Exposure from X-rays and CT Scans
Is this amount of radiation high? I had three chest X-rays between 2020 and 2021, and after an injury, I had a CT scan of my head and one cervical spine X-ray. I would like to know the total radiation exposure from these procedures.
Dr. Wang Yifen Reply:
According to information from the American Society of Radiologic Technologists, the radiation dose from three chest X-rays (including frontal and lateral views) is approximately 0.3 millisieverts, a single head CT scan has a radiation dose of about 2 millisieverts, and a thoracic...[Read More] Understanding Radiation Exposure from X-rays and CT Scans
Understanding Radiation Exposure: Is It Safe to Get Pregnant After X-rays?
Computed Tomography (CT) Scan Hello doctor, I apologize for bothering you. I am 26 years old and I had a chest X-ray in November of last year, one chest X-ray and one abdominal X-ray. In January, I had an abdominal CT scan, and in February, I had another abdominal X-ray. I would ...
Dr. Wang Yifen Reply:
Hello, the cumulative radiation dose from the X-ray examinations you mentioned is below 100 millisieverts. According to the International Commission on Radiological Protection (ICRP) report 103, doses below 100 millisieverts (whether received in a single instance or multiple inst...[Read More] Understanding Radiation Exposure: Is It Safe to Get Pregnant After X-rays?
Understanding Radiation Exposure: Is Your CT Scan Safe?
Radiation Issues Hello doctor, I would like to ask if a radiation dose of 320 mGy for a CT scan of the abdomen is considered high. The hospital informed me of this dose, and I am concerned about the risk of developing cancer. If I want to become pregnant, how long should I wait? ...
Dr. Wang Yifen Reply:
Hello, the parameters related to radiation dose in computed tomography (CT) scans are primarily two: CTDI vol and DLP. DLP (Dose-Length Product) is used to assess the total radiation dose received by the patient during a complete CT scan. DLP (units: mGy·cm) = CTDI-Vol x total sc...[Read More] Understanding Radiation Exposure: Is Your CT Scan Safe?
Understanding Radiation Exposure and Its Risks for Blood Cancer
Radiation-induced leukemia Hello doctor, when I was around 10 years old in elementary school, I had several dental X-rays due to root canal treatments. In high school, around 17 years old, I had a full-body X-ray. At 20, I had several chest X-rays (about 5) due to part-time work....
Dr. Wang Yifen Reply:
Hello, the X-ray examinations you mentioned involve low-dose radiation, with a total radiation dose not exceeding 100 millisieverts. According to the International Commission on Radiological Protection (ICRP) report 103, doses below 100 millisieverts (whether single or multiple e...[Read More] Understanding Radiation Exposure and Its Risks for Blood Cancer
Understanding Radiation Exposure: Risks and Recommendations for CT Scans
Computed Tomography (CT) scan Hello Doctor, I underwent root canal treatment in May of last year, during which I had two full-mouth X-rays and four single X-rays (one of which was taken directly in the treatment area without a lead apron). On November 4th, I had a chest X-ray dur...
Dr. Wang Yifen Reply:
Hello, according to the International Commission on Radiological Protection (ICRP) report 103, doses below 100 millisieverts (including single or multiple exposures) do not cause clinically significant functional impairment. The radiation doses from the examinations you mentioned...[Read More] Understanding Radiation Exposure: Risks and Recommendations for CT Scans
Understanding Radiation Exposure: Cancer Risks from Frequent Imaging Tests
Radiation issues Hello Doctor, due to health issues last year, I needed to monitor my brain and undergo pre-admission tests along with various examinations arranged by different physicians, which resulted in frequent exposure to radiation. I have had the following tests: 4 abdomi...
Dr. Wang Yifen Reply:
Hello, according to the American Society of Radiologic Technologists website https://www.xrayrisk.com/calculator/calculator-normal-studies.php; for a 29-year-old female, the radiation dose from 4 abdominal X-rays is approximately 2.8 millisieverts, from 10 chest X-rays is about 1...[Read More] Understanding Radiation Exposure: Cancer Risks from Frequent Imaging Tests
Does Abdominal CT Scan Affect Male Fertility? Concerns and Insights
Will an abdominal CT scan cause male infertility? Hello doctor, I recently underwent a non-contrast abdominal CT scan due to some examination factors. The scan included the area around the testes, and I am planning to conceive a child. I am concerned about any potential adverse e...
Dr. Wang Yifen Reply:
Hello, a single abdominal CT scan has a radiation dose of approximately 8 millisieverts. According to the International Commission on Radiological Protection (ICRP) report 103, doses below 100 millisieverts (including single or multiple exposures) do not cause clinically signific...[Read More] Does Abdominal CT Scan Affect Male Fertility? Concerns and Insights