Is Frequent Chest X-Ray Exposure Harmful? Understanding Risks and Concerns
Underwent six chest X-rays within six months? Hello doctor, I have had six chest X-rays in the past six months due to illness. I am concerned about any potential adverse effects. Thank you.
Dr. Yang Jinghua reply Radiology
Dear Cheng: Hello, the radiation dose from a standard chest X-ray is very low, approximately 0.02 millisieverts. The Atomic Energy Commission recommends that the annual radiation dose for the general public should not exceed one millisievert, which is equivalent to the dose fro...[Read More] Is Frequent Chest X-Ray Exposure Harmful? Understanding Risks and Concerns
Optimal Interval Between CT Scans: How Long Should You Wait?
The recommended interval between computed tomography (CT) scans of different body parts should ideally be at least several weeks to months, depending on the clinical situation and the specific areas being scanned. This is to minimize radiation exposure and ensure that the benefit...
Dr. Yang Jinghua reply Radiology
Dear Xiao Mei, Regarding the imaging examinations you mentioned during the specified period, the potential increase in cancer risk for adults is far lower than the environmental risks faced by the general population, and it cannot be proven to be related to subsequent diseases. ...[Read More] Optimal Interval Between CT Scans: How Long Should You Wait?
Understanding the Risks of Multiple CT Scans: A Patient's Guide
Abdominal Computed Tomography (CT) Scan I have undergone several examinations in the past two years. Last October, I had a CT scan from the head and neck to the upper chest on two consecutive days. The reason for the two days was that the doctor felt the initial scan did not capt...
Dr. Yang Jinghua reply Radiology
Dear Xiao Chen, Regarding the imaging examinations you mentioned during the specified period, positron emission tomography (PET) has the highest radiation dose. For adults, the potential increase in cancer risk is significantly lower than the general environmental risk and canno...[Read More] Understanding the Risks of Multiple CT Scans: A Patient's Guide
Understanding Human Exposure in Radiology: What You Need to Know
What does human exposure mean? Hello Doctor, I am a new mother with ID 122623. I would like to ask what it means to manage exposure due to human factors?
Dr. Yang Jinghua reply Radiology
In our living environment, there are various forms of natural ionizing radiation that are not specifically regulated, while the ionizing radiation generated from medical examinations is, of course, man-made. Therefore, effective shielding must be implemented for those who do not ...[Read More] Understanding Human Exposure in Radiology: What You Need to Know
Concerns About Radiation Exposure from CT Scans and X-rays
Concern about excessive radiation exposure? Hello Dr. Yang, I was hospitalized on April 5th due to a pneumothorax (the physician suspected I had a malignant tumor, but it turned out to be a misunderstanding...). On that day, the doctor arranged for a computed tomography (CT) scan...
Dr. Yang Jinghua reply Radiology
Dear Sir/Madam, First of all, I would like to congratulate you on your health and well-being. Regarding the various examinations arranged for your pneumothorax treatment, please refer to the attached document (the relative radiation dose table from the Atomic Energy Commission)....[Read More] Concerns About Radiation Exposure from CT Scans and X-rays
Impact of X-rays on Infants After a Fall: What New Parents Should Know
If a child falls from a bed and undergoes an X-ray, there are several potential impacts to consider. Firstly, the X-ray can help identify any fractures or injuries that may not be immediately visible. This is crucial for ensuring appropriate treatment and preventing complications...
Dr. Yang Jinghua reply Radiology
Dear new mothers, please rest assured that medical imaging examinations will not cause immediate physical harm. The radiation dose from a typical X-ray is not sufficient to damage cellular tissue, and it does not remain in the body. Human exposure must be managed to avoid excessi...[Read More] Impact of X-rays on Infants After a Fall: What New Parents Should Know
Comparing Low-Dose CT and Dual-Energy CT for Lung Scans
Computed Tomography (CT) Scan Regarding lung computed tomography (CT) scans, I have the following questions: 1. What are the differences in accuracy and radiation dose between low-dose computed tomography (LDCT) and dual-source dual-energy computed tomography (DSCT)? 2. I had a...
Dr. Yang Jinghua reply Radiology
Dear Mr. Hsiao-Ming, Regarding the two examinations you mentioned (lung and cardiac CT scans), the implementation of Low-Dose Computed Tomography (LDCT) in our country falls under the category of health check-ups. When performed using a dual-source CT system, the radiation dose ...[Read More] Comparing Low-Dose CT and Dual-Energy CT for Lung Scans
Smoking vs. Chest CT: Understanding Radiation Exposure and Cancer Risk
Smoking and Radiation Exposure from Chest CT Scans Hello, doctor: I came across an article stating that smoking 30 cigarettes a day accumulates approximately 16 millisieverts (mSv) of radiation exposure in a year. In comparison, a single chest CT scan exposes a person to about 7 ...
Dr. Yang Jinghua reply Radiology
Dear Mr. A-Bao: Due to the presence of trace amounts of components in cigarettes that can produce ionizing radiation, inhalation can lead to persistent effects on the lungs. The ionizing radiation from chest computed tomography (CT) scans is applied only during the examination ...[Read More] Smoking vs. Chest CT: Understanding Radiation Exposure and Cancer Risk
Understanding the Process and Radiation Dose of Chest CT Scans
The process of a chest CT scan? Hello Dr. Yang: During a chest CT scan, the radiologic technologist usually asks the patient to inhale and exhale. I would like to ask you: 1. How many times does a typical chest CT scan require inhalation and exhalation? Does one inhalation and ex...
Dr. Yang Jinghua reply Radiology
Dear A-Wen: The so-called dose for a single chest computed tomography (CT) scan is approximately 7 millisieverts, which is an average reference value; the actual dose should be based on the specific examination. For precise evaluation, a positioning assessment will be conducted p...[Read More] Understanding the Process and Radiation Dose of Chest CT Scans
Can CT Scans Detect Ulnar Nerve Damage?
Computed Tomography (CT) scan Can a computed tomography (CT) scan be performed for ulnar nerve damage? Can the damaged area be visualized?
Dr. Yang Jinghua reply Radiology
It is difficult to directly observe the ulnar nerve in Mr. OQ6078 through computed tomography (CT) imaging. Instead, we often rely on the surrounding skeletal structures, muscles, and blood vessels to assess for any signs of compression. To detect abnormal structural changes in t...[Read More] Can CT Scans Detect Ulnar Nerve Damage?
Impact of Abdominal CT on Sperm Quality and Pregnancy Safety
The impact of abdominal CT on sperm? Hello Director Yang, I had a follow-up examination for testicular cancer that included a CT scan of my abdomen and pelvis. Unfortunately, on the same day and the following day after the scan, my wife and I conceived. I am concerned whether the...
Dr. Yang Jinghua reply Radiology
Mr. Hao: Congratulations on the upcoming addition of a new life to your family. There is no clear evidence that a single computed tomography (CT) scan radiation dose causes significant sperm mutations. The principle of medical ionizing radiation exposure is to use it judiciously;...[Read More] Impact of Abdominal CT on Sperm Quality and Pregnancy Safety
Understanding Radiation Exposure: X-rays vs. MRI for Sinus and Head Issues
MRI Radiation Dose The radiation dose from a sinus X-ray is approximately 0.1 mSv, while a head MRI does not involve ionizing radiation and therefore has a radiation dose of 0 mSv. In contrast, a head CT scan typically exposes a patient to about 2 mSv of radiation. If your doctor...
Dr. Yang Jinghua reply Radiology
To lo2285: Regarding the implementation of medical imaging, clinical symptoms should be taken into consideration. For the evaluation of sinusitis, X-rays and computed tomography (CT) should be the primary modalities. When assessing the brain, computed tomography and magnetic reso...[Read More] Understanding Radiation Exposure: X-rays vs. MRI for Sinus and Head Issues
Differences Between Chest CT and Low-Dose CT for Lung Cancer Screening
What is the difference between chest CT and LDCT? Hello Dr. Yang, I would like to ask three questions: 1. Regarding lung cancer screening, is there a difference between a chest CT scan (without contrast) covered by health insurance and a low-dose chest CT scan (LDCT) that is se...
Dr. Yang Jinghua reply Radiology
Dear Mr. Chang, Regarding general chest computed tomography (CT), it is necessary to evaluate various structures in the chest. A single examination of low-dose chest CT (LDCT) typically involves a radiation dose of about 7 millisieverts (mSv) and is focused solely on assessing l...[Read More] Differences Between Chest CT and Low-Dose CT for Lung Cancer Screening
Understanding PET/CT vs. CT: Radiation Dose and Resolution Differences
The resolution issue between PET/CT and CT? Hello, doctor. Is there a significant difference in radiation exposure between a whole-body positron emission tomography (PET) scan and a chest and neck computed tomography (CT) scan? Also, I've heard that the resolution of a PET s...
Dr. Yang Jinghua reply Radiology
Dear Kay, Regarding the radiation dose of a whole-body positron emission tomography (PET) scan, in addition to the dose from the radiotracer, which is approximately 7 millisieverts (mSv), the dose from a single computed tomography (CT) scan is about 2 to 15 mSv, resulting in a t...[Read More] Understanding PET/CT vs. CT: Radiation Dose and Resolution Differences
Do X-Ray Examinations Leave Radiation Residue on Metal Items?
Radiation concerns in medical imaging? I would like to ask the doctor: If I do not remove my watch and glasses (metal frame) as well as my metal-framed underwear during an X-ray, will there be any radiation residue left on these items after the X-ray, and could this potentially a...
Dr. Yang Jinghua reply Radiology
Ms. Liu: Hello, currently, medical X-rays only have a portion of their energy absorbed by the irradiated body during exposure, and the energy is immediately dissipated; it does not accumulate in metallic objects. The impact on the human body is minimal, so please do not worry. Th...[Read More] Do X-Ray Examinations Leave Radiation Residue on Metal Items?
Is Radiation Exposure from Medical Imaging Safe? Understanding Risks and Recommendations
Can radiation be excessive? Doctor, if I had a standard dose chest CT and three X-rays for follow-up less than three months ago, and now I'm going for a mammogram, will the radiation exposure be excessive? Should I wait a few months before doing it? If the doctor advises tha...
Dr. Yang Jinghua reply Radiology
Dear Ms. Lin, Hello, currently there are no regulations governing the use of imaging examinations for medical purposes. These types of examinations involve man-made ionizing radiation, and the examination conditions are adjusted based on the principle of keeping exposure as low ...[Read More] Is Radiation Exposure from Medical Imaging Safe? Understanding Risks and Recommendations
Understanding Radiation Exposure: Air Travel and X-Ray Concerns
Radiation issues? I would like to ask the doctor: I traveled by plane from Taipei to New York round trip this August, and now I have abdominal pain and had an abdominal X-ray. Is the radiation dose from flying in such a short time combined with the X-ray exposure high? Does it ex...
Dr. Yang Jinghua reply Radiology
Dear Xiaoli, Thank you for your inquiry. Regarding the harm caused by exposure to ionizing radiation in the human body, it can be categorized into immediate tissue damage and subsequent potential effects. Based on the data you provided, no visible harm is expected. The potential...[Read More] Understanding Radiation Exposure: Air Travel and X-Ray Concerns
Understanding IVP Kidney Imaging: Radiation Concerns and Frequency
Intravenous Pyelogram (IVP) Hello, doctor. A few years ago, I had a urine test that showed trace blood (1+) and underwent renal imaging at the hospital. I remember having many X-rays taken, and the doctor said everything was normal. However, this year during my health check-up, I...
Dr. Yang Jinghua reply Radiology
Dear Mr. Xiaohong, Regarding the execution of medical imaging, it should be determined based on the needs of the patient's diagnosis and treatment. Physicians must rely on their professional judgment to conduct examinations before making accurate diagnoses and treatment pla...[Read More] Understanding IVP Kidney Imaging: Radiation Concerns and Frequency
Is CT Scan Radiation Safe for Young Children? Understanding Risks
Will young children be exposed to excessive radiation when undergoing a CT scan? Hello doctor, my son turned four today. He went to the hospital for an arrangement due to pectus excavatum, and he had an X-ray and a chest CT scan. I only found out afterward that the radiation expo...
Dr. Yang Jinghua reply Radiology
Dear Xiaoqi's Mom, Thank you for your inquiry. Medical imaging examinations assist clinicians in precise diagnosis and treatment. The amount of ionizing radiation exposure from these diagnostic tests is approximately equivalent to two years of natural background radiation. ...[Read More] Is CT Scan Radiation Safe for Young Children? Understanding Risks
Understanding Cumulative Radiation Dose from HRCT and X-rays
Regarding HRCT and the cumulative radiation dose I have received? Hello Dr. Yang, due to my autoimmune disease affecting my joints and asthma issues, this year I have undergone several imaging studies as arranged by my physician, including X-rays and a high-resolution computed to...
Dr. Yang Jinghua reply Radiology
Ms. Lee: Hello, I am pleased to answer your questions regarding radiation protection. Given that the examination protocols may vary slightly among hospitals, I will refer to the dose reference values published by the Atomic Energy Commission. For two chest computed tomography (CT...[Read More] Understanding Cumulative Radiation Dose from HRCT and X-rays