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 Radiology
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?
Do Two-Year-Olds Need Lead Shields During Chest X-Rays?
X-ray for a two-year-old child? When a 2-year-old child undergoes a chest X-ray, is it necessary to use a lead apron to shield the lower abdomen? I have been to National Taiwan University Hospital, and they always provide shielding, but at another medical center, the radiologic t...
Dr. Wang Yifen reply Radiology
Hello, considering the advancements in technology and the current evidence regarding radiation exposure risks, the American Association of Physicists in Medicine (AAPM) issued a position statement on April 2, 2019, recommending the discontinuation of the use of gonadal and fetal ...[Read More] Do Two-Year-Olds Need Lead Shields During Chest X-Rays?
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 Radiology
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 Radiology
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 Radiology
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
Understanding MRI Report Findings: Common Questions Explained
MRI Report Issues Hello, doctor! I have a few questions regarding my MRI report that I would like to clarify. Here is the content of the report, and I would appreciate your assistance in addressing my concerns. Thank you! "Patent intracranial major arteries on MRA. Endplat...
Dr. Wang Yifen reply Radiology
Hello, the literal meaning of these sentences is as follows: The major blood vessels in the brain are patent on magnetic resonance angiography. There are multiple endplate changes in the lower thoracic vertebrae. The endplate changes in the lower thoracic vertebrae are noted. Ima...[Read More] Understanding MRI Report Findings: Common Questions Explained
Impact of Bluetooth Shoes on MRI Results: Is There a Risk?
Magnetic Resonance Imaging (MRI) Hello, Director. Recently, a family member underwent an MRI of the knee and later realized that they brought their Bluetooth-enabled athletic shoes into the examination room. During the procedure, the shoes were removed and placed on the floor nex...
Dr. Wang Yifen reply Radiology
Hello, the distance between the shoes placed on the floor and the imaging table should exceed 1 meter to avoid any discrepancies in the examination. If the images are affected by magnetic field interference, any artifacts are usually detectable during the examination. If you stil...[Read More] Impact of Bluetooth Shoes on MRI Results: Is There a Risk?
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 Radiology
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 Radiology
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
Understanding Gadolinium Deposition: Risks and Concerns for Patients
Gadolinium-based contrast agent deposition Hello, doctor. Two years ago, I underwent a cervical MRI at another hospital and was administered a contrast agent (I recently called to inquire and found out it was MultiHance). Later, I came across news and literature indicating that g...
Dr. Wang Yifen reply Radiology
Hello, regarding the potential accumulation of gadolinium-based contrast agents in the brain, the Ministry of Health and Welfare has reassessed their clinical benefits and risks based on Article 48 of the Pharmaceutical Affairs Act. On November 23, 2017, it was announced that aft...[Read More] Understanding Gadolinium Deposition: Risks and Concerns for Patients
Does a Total Radiation Dose of 6.131 mSv Increase Cancer Risk?
A radiation exposure of 6.081 millisieverts in one month could potentially increase the risk of cancer, depending on various factors such as individual susceptibility and overall health. Additionally, a total radiation dose of 6.131 millisieverts may also contribute to cancer ris...
Dr. Wang Yifen reply Radiology
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] Does a Total Radiation Dose of 6.131 mSv Increase Cancer Risk?
Is It Safe to Get Full Spine X-Rays Without Protection?
Lateral cervical spine X-ray? Hello, doctor! I went to see a rehabilitation specialist because of numbness in my foot. The rehabilitation department recommended that I get X-rays of my entire spine, including lateral views. During the entire procedure, I did not wear a lead apron...
Dr. Wang Yifen reply Radiology
Hello, diagnostic X-ray examinations involve low-dose radiation. According to the American Society of Radiologic Technologists, the radiation dose from a single lumbar spine X-ray is approximately 1.5 millisieverts. The International Commission on Radiological Protection (ICRP) r...[Read More] Is It Safe to Get Full Spine X-Rays Without Protection?
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 Radiology
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 Chest X-Ray Findings for Heart Stents
Consultation for Chest X-ray Examination Hello Director Wang, I would like to ask if a self-funded drug-eluting stent that has been placed in the heart can be seen on a chest X-ray examination? How would the chest X-ray report describe the presence of the stent? Thank you for you...
Dr. Wang Yifen reply Radiology
Hello, the position of a cardiovascular stent on a chest X-ray may overlap with the organs in the mediastinum, or the material of the stent may have varying degrees of X-ray penetration. Therefore, a chest X-ray may not necessarily reveal the presence of a heart stent, and the ex...[Read More] Understanding Chest X-Ray Findings for Heart Stents
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 Radiology
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 Radiology
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 Radiology
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
Understanding Your Mammogram Report: What Mild Regressive Changes Mean
Mammography Hello Dr. Wang, this year I had a mammogram, and the report contains a section that says: "Mammographic lesions: Mild regressive change of the previous irregular equal-density nodule in the lower portion of the left breast, middle third, only seen on the MLO view...
Dr. Wang Yifen reply Radiology
Hello, the report generated by the physician includes descriptions of the imaging findings, comparisons with previous images, and the physician's final conclusions regarding the classification of the imaging results and recommendations for follow-up. According to the America...[Read More] Understanding Your Mammogram Report: What Mild Regressive Changes Mean
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 Radiology
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 Radiology
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