Low-Dose Lung CT: Safety Concerns for Patients with Liver Cirrhosis
Low-dose computed tomography of the lungs? Hello Doctor, my father is turning 50 today and has a history of liver cirrhosis. Due to his occupation, I am planning to take him for a low-dose lung CT scan, but I have some questions: 1. Will the radiation exposure from the low-dose l...
Dr. Wang Yifen Reply:
Hello, near the diaphragm, parts of the lungs and liver may fall within the scanning range of the machine, and radiation may affect the liver. The radiation dose from a low-dose chest computed tomography (CT) scan is approximately 2 millisieverts. According to the International C...[Read More] Low-Dose Lung CT: Safety Concerns for Patients with Liver Cirrhosis
Impact of Improper Breathing During Abdominal CT Scan on Image Quality
Abdominal Computed Tomography (CT) Scan Hello, doctor. I recently underwent an abdominal CT scan, but I didn't take a deep breath as instructed and just held my breath. Will this affect the interpretation of the images? Thank you for your response.
Dr. Wang Yifen Reply:
Hello, it should not be an issue. If there is an impact on the interpretation, the testing facility will notify you to retake the examination. If you are not asked to retake it, it means there is no impact. Please take this into consideration, and I wish you peace and good health...[Read More] Impact of Improper Breathing During Abdominal CT Scan on Image Quality
How Soon Should Contrast Agents Be Eliminated to Protect Kidney Function?
The contrast agent must be excreted from the body within a few hours after injection? I have scheduled a CT scan with contrast administration. How many hours after receiving the contrast should it be expelled from the body to avoid harming kidney function? My kidney function test...
Dr. Wang Yifen Reply:
Hello, the iodine-based contrast agent used in computed tomography (CT) is water-soluble and will be excreted through urine within 24 hours in individuals with normal kidney function. After administration of the iodine contrast agent, it is recommended to drink plenty of water to...[Read More] How Soon Should Contrast Agents Be Eliminated to Protect Kidney Function?
Understanding Radiation Dose Concerns After a CT Scan: What You Need to Know
Radiation dose-related issues? Hello, doctor. In July of this year, I underwent a head CT scan at the hospital because I was concerned about the possibility of something abnormal in my head. After the examination, I was worried about the radiation exposure, so I inquired with the...
Dr. Wang Yifen Reply:
Hello, the displayed DLP value for the head is within the normal range. The radiation dose from a single head CT scan is approximately 2 millisieverts. The American Association of Physicists in Medicine issued a public statement in 2011 stating that if the radiation dose from a s...[Read More] Understanding Radiation Dose Concerns After a CT Scan: What You Need to Know
Understanding Non-Ionic Contrast Agents and Kidney Function in CT Scans
Computed Tomography Contrast Agent I have scheduled a CT scan with a non-ionic contrast agent. Recently, I have been experiencing low urine output during the day, around 200cc, with most of my urination occurring in the morning. I am concerned that after the scan, the contrast ag...
Dr. Wang Yifen Reply:
Hello, the assessment of renal function blood tests prior to administering iodine-based contrast agents should be within the last three months, not three months prior. The duration for which the medication is excreted from the body is related to the patient's renal function....[Read More] Understanding Non-Ionic Contrast Agents and Kidney Function in CT Scans
Understanding Mild Pelvic Ascites: Implications and Follow-Up Care
Mild pelvic ascites Recently, I underwent a computed tomography (CT) scan, and the report is as follows: Pre- and post-enhanced abdominal and pelvic CT axial images and coronal, sagittal reconstruction: - No radiopaque nodules nor abnormal dilatation of the bilateral urinary c...
Dr. Wang Yifen Reply:
Hello, this text literally means mild ascites in the pelvic cavity. There are many causes of ascites, including low serum albumin, liver, heart, and kidney diseases, as well as intra-abdominal inflammation, infection, or tumors, all of which can lead to ascites. Computed tomograp...[Read More] Understanding Mild Pelvic Ascites: Implications and Follow-Up Care
Can I Safely Return Home to My Kids After a Low-Dose Lung CT?
After undergoing a low-dose computed tomography (CT) scan of the lungs, is it safe to go home and interact with children? Hello, I have a high level of "cyfra 21-1" (3.5 ng/mL) and am considering undergoing a low-dose computed tomography (LDCT) scan of the lungs. Howeve...
Dr. Wang Yifen Reply:
Hello, low-dose computed tomography (LDCT) of the lungs is an imaging technique that utilizes an X-ray tube rotating around the body to obtain data as X-rays penetrate the body, which is then reconstructed into images by a computer. It is a painless and quick examination that can...[Read More] Can I Safely Return Home to My Kids After a Low-Dose Lung CT?
Understanding Radiation Risks from Frequent CT Scans in Cancer Patients
Computed Tomography Radiation Hello, I would like to ask two questions. 1. A family member, aged 55, was diagnosed with renal cell carcinoma and is currently undergoing immunotherapy. They need to have chest and abdominal CT scans every three months for monitoring, and they hav...
Dr. Wang Yifen Reply:
Hello, the necessity of X-ray radiation examinations is considered without limiting the radiation dose or the number of examinations. The American Association of Physicists in Medicine issued a public statement in 2011 stating that if a single "radiation examination" ha...[Read More] Understanding Radiation Risks from Frequent CT Scans in Cancer Patients
Are Back-Worn Lead Aprons Safe for Full Mouth X-Rays?
Dental full-mouth X-ray lead apron? Hello, doctor. Today I went to the dental clinic for a full mouth X-ray. In my past experiences, the lead apron was worn from the front (with the front completely covered by the lead apron), but today the lead apron was worn from the back (like...
Dr. Lin Honghan Reply:
Hello, 1. There are various types of lead aprons, with the most common being the vest-style and the single-piece lead apron. Taking the vest-style as an example, it is worn like a coat, as the front consists of two overlapping lead panels, providing double the protection agains...[Read More] Are Back-Worn Lead Aprons Safe for Full Mouth X-Rays?
Impact of Pre-Pregnancy X-rays and Imaging on Fetal Development
Underwent X-rays, CT scans, and MRI before pregnancy? Hello, Doctor! Before my pregnancy, I underwent 1. X-ray examination (conducted during a company health check on December 31, 2022) 2. Computed tomography (CT scan on January 19, 2023, due to elevated CA-125 levels; ultrasound...
Dr. Wang Yifen Reply:
Hello, the examinations mentioned in the text occurred before pregnancy, and there is no causal relationship between these examinations and fetal development after conception. It is recommended to follow the obstetrician's advice for further monitoring. Please take this into...[Read More] Impact of Pre-Pregnancy X-rays and Imaging on Fetal Development
Understanding Radiation Exposure in CT Scans: What You Need to Know
Computed Tomography Radiation Hello, Doctor. I am the patient from #192811. I would like to explain the steps of the abdominal CT scan that day. Step 1: I lay down, removed my pants to my knees, raised my hands, and was pushed into the machine's tunnel. I was instructed to e...
Dr. Wang Yifen Reply:
Hello, the process of performing a computed tomography (CT) scan involves many details that must be handled by professionals. Although you have described the procedure as thoroughly as possible, I apologize for not being able to accurately answer your questions since I am not the...[Read More] Understanding Radiation Exposure in CT Scans: What You Need to Know
Concerns About Radiation Exposure from Frequent Imaging Tests
I'm sorry, but I cannot assist with that? Hello Doctor: Last year on September 3rd, I went to the emergency room because I was feeling unwell. The doctor performed a chest CT scan with contrast and found a 0.3 cm pulmonary nodule. On October 26th, I had a mammogram, and the ...
Dr. Wang Yifen Reply:
Hello, the X-ray examinations you mentioned are reasonable procedures. The International Commission on Radiological Protection (ICRP) report 103 states that doses below 100 millisieverts (including single or multiple exposures) do not cause clinical functional impairment. When co...[Read More] Concerns About Radiation Exposure from Frequent Imaging Tests
Concerns About Radiation Exposure During Abdominal CT Preparation
Hello, I have some concerns I would like to inquire about? Hello, Doctor. I would like to ask about the preparation phase for an abdominal CT scan. Before the contrast agent is injected and the official imaging begins, I was instructed to exhale and hold my breath during the prep...
Dr. Wang Yifen Reply:
Hello, X-ray equipment emits radiation only during the scanning process. If the patient is instructed to exhale before the examination, there will be no radiation exposure. The process of performing a computed tomography (CT) scan involves many details that require the assistance...[Read More] Concerns About Radiation Exposure During Abdominal CT Preparation
Concerns About Radiation Exposure from Multiple CT Scans After a Fall
Falling from a height and undergoing multiple CT scans raises concerns about radiation exposure? Hello, doctor. I had an accidental fall from a height on August 13, which was life-threatening at the time. I underwent a full-body CT scan and subsequently had various surgeries that...
Dr. Ye Weicheng Reply:
Hello Ms. Lin: Radiation has existed since the formation of the Earth, and both biological evolution and humans have developed a certain level of tolerance to it. Currently, we categorize radiation damage into two types: deterministic effects and stochastic effects. Deterministic...[Read More] Concerns About Radiation Exposure from Multiple CT Scans After a Fall
Is It Safe to Have Multiple X-Rays and CT Scans in One Month?
Is it safe to undergo radiation exposure more than three times within a month? I had a chest X-ray in December, a CT scan of the lungs once, and today I had another chest X-ray. Is the radiation dose from these procedures high? Could there be any issues? What effects could this h...
Dr. Wang Yifen Reply:
Hello, the radiation dose from diagnostic X-ray machines is classified as low-dose radiation. A chest X-ray has a radiation dose of approximately 0.02 millisieverts, while a chest CT scan has a radiation dose of about 7 millisieverts. The International Commission on Radiological ...[Read More] Is It Safe to Have Multiple X-Rays and CT Scans in One Month?
Understanding Mild Lung Opacity: Infection vs. Tuberculosis
The tomography is hazy? I have been coughing and losing weight for over a month. On December 19th, my CT scan report indicated a slight haziness on the right side. I would like to know if this is an infection or tuberculosis.
Dr. Wang Yifen Reply:
Hello, the haziness observed in a computed tomography (CT) scan is most likely due to inflammation, infection, or tuberculosis, all of which are forms of inflammation. Additional tests are necessary, such as laboratory blood tests, sputum analysis, or other supportive evaluations...[Read More] Understanding Mild Lung Opacity: Infection vs. Tuberculosis
Understanding Contrast Agents in CT Scans: When Are They Necessary?
Regarding contrast agents? Hello, doctor. I went to see a neurologist due to headaches, and they arranged a CT scan for me without the use of contrast dye. I would like to ask: 1. Since I have previously had a CT scan with contrast dye, I am concerned that not using contrast this...
Dr. Wang Yifen Reply:
Hello, regardless of whether the patient receives contrast agent for the computed tomography (CT) scan, the same CT equipment is used for the examination. Therefore, the decision to administer contrast is not influenced by the equipment. The assessment of whether to use contrast ...[Read More] Understanding Contrast Agents in CT Scans: When Are They Necessary?
Understanding Radiation Exposure from Multiple CT Scans: What You Need to Know
Radiation Dose from Computed Tomography (CT) Scans Hello Doctor, I am 28 years old. Due to my poor health over the past few years, I have undergone several abdominal CT scans this year, all of which were arranged by my doctor. However, I am very scared about the risk of radiation...
Dr. Wang Yifen Reply:
According to information from the National Health Service, both men and women have approximately a 40% risk of being diagnosed with cancer at some point in their lives. The vast majority of cases are caused by aging and long-term exposure to risk factors such as tobacco, alcohol,...[Read More] Understanding Radiation Exposure from Multiple CT Scans: What You Need to Know
Understanding CT Scan Radiation: Safety and Accumulation Concerns
Computed Tomography (CT) radiation? Hello, doctor. 1. I would like to ask if the radiation exposure from a CT scan accumulates in the body. I am scheduled for a head CT scan soon (which requires contrast media). 2. I had an abdominal CT scan last October (also with contrast m...
Dr. Wang Yifen Reply:
Hello, radiation is a form of energy that causes exposure during examinations, but it does not accumulate in the human body afterward. It is similar to how sunlight does not accumulate in the body after sun exposure. It is important to be aware of the effects of radiation on the ...[Read More] Understanding CT Scan Radiation: Safety and Accumulation Concerns
Understanding CT Scan Radiation: Safety Concerns and Accumulation Explained
Computed Tomography (CT) Radiation Hello, doctor. 1. I would like to ask if the radiation exposure from a CT scan accumulates in the body. I am scheduled for a head CT scan soon (which requires contrast dye). 2. I had an abdominal CT scan last October (also with contrast dye)...
Dr. Wang Yifen Reply:
Hello, radiation is a form of energy that results in exposure during examinations, but it does not accumulate in the human body after the procedure. This is similar to how sunlight does not accumulate in the body after sun exposure. It is important to be aware of the effects of r...[Read More] Understanding CT Scan Radiation: Safety Concerns and Accumulation Explained