Understanding Lung Nodules: Coronal vs. Axial CT Scan Views Explained
Lung Computed Tomography (CT) - Issues Related to Nodule Location in Coronal and Axial Views? Hello Dr. Wang: During a health check-up, two nodules were detected in my left lung. The following CT scan shows one of the nodules in the coronal view: https://imgur.com/a/zu1QmsH. I wo...
Dr. Wang Yifen Reply:
The nodule in the coronal view appears to correspond more closely to the nodule within the left red box in the axial view (referring to the viewer's left). A lung CT scan performed during a health check can generate over 400 images through computer reconstruction. To accurat...[Read More] Understanding Lung Nodules: Coronal vs. Axial CT Scan Views Explained
Assessing Radiation Exposure from Dental X-rays and Air Travel for Kids
Pediatric Computed Tomography (CT) Scan Hello Dr. Wang: My 10-year-old daughter has a suspected 0.5 cm bony hard mass in her mandible. On June 9, she had a full-mouth X-ray taken at an orthodontic clinic, and on June 25, she had another full-mouth X-ray and a self-paid cone beam ...
Dr. Wang Yifen Reply:
A 10-year-old female received a radiation dose of approximately 0.22 millisieverts from two full-mouth X-rays and one dental computed tomography scan. The radiation dose from a round-trip international flight to Europe or the United States is about 0.16 millisieverts. The total r...[Read More] Assessing Radiation Exposure from Dental X-rays and Air Travel for Kids
Can You Walk In for a CT Scan or Do You Need an Appointment?
CT appointment time In general, for a CT scan, it is usually necessary to make an appointment in advance. However, some facilities may allow for walk-in patients, depending on their availability and scheduling. For instance, if you arrive at the front desk in the morning, you may...
Dr. Wang Yifen Reply:
The examination schedule will be arranged based on the patient's source. For emergency patients, after the emergency physician issues the examination order, the CT scan department will utilize available time slots to perform the examination as soon as possible. For outpatien...[Read More] Can You Walk In for a CT Scan or Do You Need an Appointment?
Understanding Ground-Glass Opacity (GGO) in Lung CT Scans: A Guide
Please inquire about the interpretation of ground-glass opacities (GGO) in computed tomography (CT) scans? Hello Dr. Wang, A few weeks ago, I underwent a low-dose computed tomography (CT) scan of my lungs, which revealed a 0.5 cm ground-glass opacity (GGO) in the left lung that ...
Dr. Wang Yifen Reply:
Ground-glass opacities (GGO) are a nonspecific sign with a wide range of etiologies, including infections, chronic interstitial diseases, and acute alveolar diseases. In the provided images, the hazy appearance (GGO) is most prominent in the areas circled in red. When interpretin...[Read More] Understanding Ground-Glass Opacity (GGO) in Lung CT Scans: A Guide
Understanding Radiation Risks: Insights on CT Scans and Cancer Concerns
Radiation issues Dear Director Wang, Thank you very much for your detailed explanation of the advantages and disadvantages of computed tomography (CT) scans in response to my previous questions. I am particularly concerned about the potential harm caused by radiation, which is i...
Dr. Wang Yifen Reply:
According to the American Society of Radiologic Technologists, a 22-year-old male undergoing a standard abdominal CT scan has a 99.9% chance of not developing additional cancer risk. The benefit of undergoing a CT scan is that it provides diagnostic reference for physicians. Rese...[Read More] Understanding Radiation Risks: Insights on CT Scans and Cancer Concerns
Concerns About CT Scan Radiation Exposure and Its Health Risks
I am very concerned about the potential harm from radiation exposure during a CT scan? Hello Director Wang, I am a patient from the Taipei Chang Gung Emergency Department on the early morning of March 27. I am just 22 years old and experienced pain in my lower right abdomen that...
Dr. Wang Yifen Reply:
1. The CT images are synthesized by a computer to form the final images. The number of breaths taken during the examination, as well as the scanning area and breath-holding time, varies from person to person. Since your main complaint is right lower abdominal pain, the typical sc...[Read More] Concerns About CT Scan Radiation Exposure and Its Health Risks
Understanding Bilateral Lower Lung Nodules: Next Steps After X-Ray Findings
Bilateral lower lung nodular shadows? In the health check report, the chest X-ray examination shows bilateral lower lung nodular shadows. Should further examination be conducted?
Dr. Wang Yifen Reply:
Bilateral lower lung nodular shadows are noted. It is recommended to visit the pulmonary medicine outpatient clinic for evaluation by a physician to determine whether additional X-ray imaging of the nodules is necessary, or to arrange for other examinations such as a low-dose com...[Read More] Understanding Bilateral Lower Lung Nodules: Next Steps After X-Ray Findings
Impact of X-rays on Fertility Treatments: What You Need to Know
X-ray issues Hello, I am currently undergoing infertility treatment, which requires regular administration of ovulation injections and medication. My company recently scheduled a health check that includes an X-ray. I asked my doctor, and they advised against it. I would like to ...
Dr. Wang Yifen Reply:
Please discuss the risks and benefits of the X-ray examination with your physician before deciding whether to proceed. Since X-ray examinations involve ionizing radiation, there is a potential risk of fetal malformation or miscarriage for pregnant women. It is essential to confir...[Read More] Impact of X-rays on Fertility Treatments: What You Need to Know
Understanding the Risks of Multiple X-Ray Exposures in Dental Care
Excessive exposure to X-rays in a short period of time? Hello, Doctor. Since December of last year until now in April, I have undergone multiple dental procedures, including wisdom tooth extraction. Due to my excessive concern about cavities in my wisdom teeth, I have visited sev...
Dr. Wang Yifen Reply:
According to the calculation method provided by the American Society of Radiologic Technologists, the radiation dose from five dental X-rays is approximately 0.025 mSv, while the dose from six full-mouth X-rays is about 0.06 mSv. A single 3D dental computed tomography (CT) scan h...[Read More] Understanding the Risks of Multiple X-Ray Exposures in Dental Care
Understanding the Relationship Between X-Ray Dose and Exposure Time
The relationship between X-ray dosage and exposure time is that the longer the exposure time, the higher the radiation dose received by the patient. This is because the amount of radiation delivered is directly proportional to the duration of exposure. Therefore, to minimize radi...
Dr. Wang Yifen Reply:
Dose unit: Sievert (Sv), which indicates the magnitude of radiation's impact on the human body. 1 Sievert (Sv) = 1000 millisieverts (mSv); 1 millisievert (mSv) = 1000 microsieverts (µSv). The radiation exposure dose is related to factors such as exposure time and distance, a...[Read More] Understanding the Relationship Between X-Ray Dose and Exposure Time
Can Heart Stents Safely Undergo MRI Scans? A Patient's Dilemma
Can a patient with a stent installed during cardiac catheterization undergo an MRI examination? Dear Director Wang, I am a heart disease patient who had three coronary stents implanted at Medical Center A in mid-March 2017. Additionally, I am receiving treatment for cervical and...
Dr. Wang Yifen Reply:
Hello Mr. Li, regarding the explanation of Magnetic Resonance Imaging (MRI), here are the details: MRI is a specialized examination conducted in a strong magnetic field environment, and a thorough safety assessment of the patient prior to the MRI is essential. Certain metals may ...[Read More] Can Heart Stents Safely Undergo MRI Scans? A Patient's Dilemma
Can MRI and CT Scan Detect Brain Imbalance Issues?
Magnetic Resonance Imaging (MRI) of the brain Hello doctor, can brain imbalance (as indicated by the eye movement test and visually evoked potentials) be detected through a head MRI (with contrast) and a CT scan?
Dr. Ye Weicheng Reply:
There are many causes of brain imbalance. It is recommended that you first consult a neurologist. After evaluation by the neurologist, further imaging such as a CT scan or MRI may be performed based on clinical necessity.[Read More] Can MRI and CT Scan Detect Brain Imbalance Issues?
Understanding Radiation Exposure from Pediatric CT Scans
Radiation Concerns in Pediatric Brain CT Scans Hello Dr. Wang, about six years ago, my child underwent a brain CT scan at a medical center when he was just over a month old. I am unsure how much radiation dose was absorbed based on the technology at that time. Could this have any...
Dr. Wang Yifen Reply:
The assessment of radiation dose and risk is primarily based on average values for adults. An adult receives approximately 2 millisieverts of radiation from a single brain CT scan, with more than 99% of individuals not experiencing an increased risk of additional cancer. The calc...[Read More] Understanding Radiation Exposure from Pediatric CT Scans
Understanding Chest X-Ray Challenges: Accuracy and Comparison Insights
Left chest pain X-ray issues? 1. It is indeed recommended to have chest X-rays performed at the same hospital, as using the same machine allows for better comparison of images over time, making it easier to detect any changes. 2. The technical capabilities of X-ray machines can ...
Dr. Wang Yifen Reply:
1. Chest X-ray examinations are not required to be performed on the same machine or at the same hospital. 2. Hospitals that have passed evaluation by the medical review committee will have qualified radiologic technologists perform X-rays for patients, ensuring a competent level ...[Read More] Understanding Chest X-Ray Challenges: Accuracy and Comparison Insights
Is Low-Dose Lung CT Enough to Replace Chest X-Ray in Health Checks?
Is low-dose computed tomography of the lungs redundant compared to chest X-ray examination? Hello, general health check-up packages usually include a chest X-ray. If I opt to pay out-of-pocket for a low-dose lung CT scan, can I skip the chest X-ray to avoid duplication? If both t...
Dr. Wang Yifen Reply:
Chest X-rays and low-dose computed tomography (CT) scans of the lungs are obtained using different imaging diagnostic tools and should not be considered duplicate examinations. For lung cancer screening, it is recommended to use low-dose CT scans as the screening tool. General he...[Read More] Is Low-Dose Lung CT Enough to Replace Chest X-Ray in Health Checks?
Concerns About Radiation and Food Safety in Taiwan After Japan's Nuclear Disaster
Radiation Pollution and Food Safety in Japan Hello, I am currently two months pregnant and living on the Northeast coast of the United States. I really hope to return to Taiwan for two or three months, but I am very concerned about the environmental radiation issues in Taiwan. My...
Dr. Wang Yifen Reply:
1. Regarding food safety issues in Japan, as a non-radiological diagnostic medical professional, it is recommended to consult the Ministry of Health and Welfare's Food and Drug Administration or refer to the FDA's official website under the "Japan Food Management S...[Read More] Concerns About Radiation and Food Safety in Taiwan After Japan's Nuclear Disaster
Understanding CT Scan Radiation: Managing Anxiety and Health Risks
Computed Tomography Radiation Hello Doctor, I undergo health check-ups every year, with two X-rays each time and an abdominal ultrasound annually. Recently, due to frequent headaches, my doctor ordered a CT scan of my brain, which showed no issues, but an incidental finding of a ...
Dr. Wang Yifen Reply:
The radiation dose from a brain CT scan is approximately 2 millisieverts, while the radiation dose from a lung CT scan is about 7 millisieverts. Ionizing radiation may induce cellular mutations that can lead to cancer, with the probability of occurrence being dose-dependent. Howe...[Read More] Understanding CT Scan Radiation: Managing Anxiety and Health Risks
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:
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:
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:
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
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 |