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:
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:
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:
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:
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:
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
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:
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:
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?
Concerns About Multiple X-Ray Exposures in Two and a Half Months
Number of X-rays taken within two and a half months? Hello, doctor. Recently, I have been experiencing various discomforts in my body, and from the end of December last year to the beginning of March this year, I underwent several X-rays: one of the throat at the end of December,...
Dr. Wang Yifen Reply:
In general, the radiation dose from chest X-rays and dental X-rays is quite low. If multiple X-ray examinations are required, it is advisable to discuss the necessity of the tests with your physician beforehand.[Read More] Concerns About Multiple X-Ray Exposures in Two and a Half Months
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:
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 Post-Angiography Wound Issues: What to Watch For
Issues Related to Wound After Angiography I had a vascular angiography last month due to an arteriovenous malformation, and the puncture site in the groin has healed well. However, there is a small, slightly raised dark red area at the puncture site that hasn't changed much....
Dr. Wang Yifen Reply:
After the angiography, a small dark red raised area has appeared at the wound site. The possible causes can only be determined through a clinical examination by a physician. It is recommended to promptly return to the original hospital for wound assessment and follow-up.[Read More] Understanding Post-Angiography Wound Issues: What to Watch For
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:
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:
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
Is Your Radiation Exposure Too High? Understanding Imaging Risks
Is the radiation level too high? Hello Doctor, in April 2016, I had a chest X-ray as part of my health check-up. In October 2016, due to issues with my head and neck, I underwent a CT scan of the head and neck with contrast. The next day, the doctor mentioned that the images were...
Dr. Wang Yifen Reply:
In general, the radiation doses from chest X-rays, low-dose CT scans of the lungs, and bone density X-rays are quite low. However, if multiple CT scans are required, it is advisable to discuss the necessity of the examinations with your physician beforehand.[Read More] Is Your Radiation Exposure Too High? Understanding Imaging Risks
Radiation Exposure and Pregnancy: What You Need to Know
Radiation and Pregnancy: Related Issues Hello, Director. I have been experiencing shoulder pain, so I visited an orthopedic doctor today. The doctor had me undergo four X-rays of my shoulder and a magnetic resonance imaging (MRI) scan that lasted about 20 minutes. I would like to...
Dr. Wang Yifen Reply:
There are multiple factors to consider regarding pregnancy status. It is recommended to visit an obstetrics and gynecology clinic for evaluation. After a consultation with a specialist, further management should be based on the obstetrician's recommendations.[Read More] Radiation Exposure and Pregnancy: What You Need to Know
What to Do If You've Been Exposed to Excessive Radiation?
What to do if you have been exposed to excessive radiation? Dear Dr. Sun, I apologize if I have submitted the consultation form multiple times, as I am not very familiar with using electronic devices. In December, I underwent a nuclear medicine cardiac examination due to chest p...
Dr. Sun Shengyi Reply:
The total radiation dose received is approximately 20 millisieverts. While this is not yet at a dangerous level, it is indeed somewhat high. The dose from a standard X-ray is relatively low (especially dental X-rays, which are only 0.01 millisieverts), but nuclear medicine proced...[Read More] What to Do If You've Been Exposed to Excessive Radiation?
Is 10 Millisieverts of Radiation Exposure in a Year Too Much?
Is 10 millisieverts a lot in a year? Hello, Dr. Sun. This year, due to various medical issues, I had a total of 2 abdominal X-rays, 3 frontal chest X-rays, 1 lateral chest X-ray, and one chest CT scan with contrast (not low-dose). After researching online, it seems that the total...
Dr. Sun Shengyi Reply:
A dose of 10 millisieverts is not particularly concerning; however, since the likelihood of radiation damage increases with higher doses and there is no definitive safety threshold, as well as the cumulative nature of its biological effects, it is still advisable to minimize unne...[Read More] Is 10 Millisieverts of Radiation Exposure in a Year Too Much?
How to Detect Excess Radiation Exposure in the Human Body?
How to determine if the human body has been exposed to excessive radiation? How can a doctor determine if their body has been exposed to excessive radiation? What methods can be used for detection? If there is already an issue with radiation overexposure, are there any solutions ...
Dr. Sun Shengyi Reply:
Unless radioactive substances are ingested or injected into the body, the radiation dose received from external exposure (such as X-rays) cannot be measured afterward. Aside from unavoidable natural background radiation, unnecessary exposure should be minimized, especially regard...[Read More] How to Detect Excess Radiation Exposure in the Human Body?
Concerns About Radiation Exposure from Frequent CT Scans
I am very concerned about exceeding radiation levels? Hello, doctor. Thank you for taking the time to help answer my questions. Due to my sinusitis, I originally had a sinus CT scan scheduled for next month. However, this week I experienced abdominal pain, and my doctor recommend...
Dr. Sun Shengyi Reply:
The radiation dose from a single abdominal CT scan with contrast injection is approximately 6-12 mSv (millisieverts), and this dose may vary depending on the purpose and scope of the examination. In contrast, a single head CT scan is about 2.0 mSv. The likelihood of this dose cau...[Read More] Concerns About Radiation Exposure from Frequent CT Scans
Understanding the Risks of Consuming Food After a Nuclear Disaster
Regarding the issue of food safety after a nuclear disaster? Hello, doctor. I would like to ask, if someone accidentally consumes food contaminated by nuclear disaster, is there an immediate harm to the body? If it is only consumed once, will it lead to cancer? Can the body natur...
Dr. Sun Shengyi Reply:
The probability of experiencing harm from consuming food contaminated by radiation from a nuclear disaster is very low, so there is no need for concern. The food ingested will be expelled from the body, which means the source of radiation is eliminated, stopping further exposure;...[Read More] Understanding the Risks of Consuming Food After a Nuclear Disaster
Alternatives to X-Ray for Monitoring Calcium Masses: Safety Concerns
Chest mass, X-ray radiation dose? Hello, Doctor. My mother recently underwent a breast examination that included an X-ray, which revealed a calcified mass. The outpatient physician has advised her to have X-rays every six months for monitoring. My mother is concerned about radiat...
Dr. Wang Yifen Reply:
If the results of a mammogram are classified as category 3 by the American College of Radiology's Breast Imaging Reporting and Data System (ACR BI-RADS category 3: probably benign finding), it is recommended that the patient undergo follow-up mammograms every six months unti...[Read More] Alternatives to X-Ray for Monitoring Calcium Masses: Safety Concerns
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 |