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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 Radiology
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


Understanding CT Scans: Radiation Exposure and Image Quality Concerns

Computed Tomography (CT) scan Hello Doctor, last November I underwent an abdominal CT scan at a small hospital in Yilan due to diarrhea and abdominal pain. Since my condition did not improve, I found out that the CT scan was performed with 4 slices. I would like to ask the doctor...


Dr. Ye Weicheng reply Radiology
Dear Mr. A-Zhen, Regarding your questions about computed tomography (CT) scans, let me explain: 1. Is a 4-slice CT scan performed in multiple passes for the abdomen, and does the radiation dose increase? Answer: Generally, the range of a CT scan is determined by the radiologic...

[Read More] Understanding CT Scans: Radiation Exposure and Image Quality Concerns


Is It Safe to Take Chest X-rays Without Protective Gear?

Chest X-ray taken without wearing protective clothing? As a college freshman, I went to the hospital for a general health check-up, which included a chest X-ray. I asked the technician twice if I needed to wear a lead apron, and both times they said it wasn't necessary. Shou...


Dr. Ye Weicheng reply Radiology
The response content is detailed in the attached information. Director Yeh Wei-Cheng, Department of Radiology, Nantou Hospital.

[Read More] Is It Safe to Take Chest X-rays Without Protective Gear?


CT Scans for Newborns: Safety Concerns and Alternatives Explained

Computed Tomography for Newborns The baby is one week old and suspected to have a spinal defect. An ultrasound was performed, but the doctor indicated that the images were unclear and recommended an MRI. However, after the baby was given sedatives, they still woke up, and the doc...


Dr. Ye Weicheng reply Radiology
Please refer to the attached information. Director Yeh Wei-Cheng, Department of Radiology, Nantou Hospital.

[Read More] CT Scans for Newborns: Safety Concerns and Alternatives Explained


Understanding Neck Ultrasound: Differences Between Standard and Interventional Procedures

Head and neck ultrasound equipment Hello, a few days ago I visited the ENT department at a local hospital. I initially wanted the doctor to schedule an ultrasound examination, thinking it was the type that could be done directly in the outpatient setting. Later, I realized that t...


Dr. Ye Weicheng reply Radiology
Hello Mr. Jeff: Generally, ultrasound can be performed after applying conductive gel. If a biopsy is needed, it is usually because an abnormality was detected on the ultrasound images or other imaging studies, and the ultrasound is used to guide the tissue sampling. Therefore, re...

[Read More] Understanding Neck Ultrasound: Differences Between Standard and Interventional Procedures


Understanding the Impact of Accidental X-Ray Exposure in Radiology

X-ray radiation issues? Hello, Doctor: I am a student in the radiology department. Yesterday, while I was checking if the lead door was securely closed, my classmate accidentally pressed the exposure button, which seemed to activate the imaging. The machine displayed mas 250 and ...


Dr. Ye Weicheng reply Radiology
Hello, Liu Xiaodi: Regarding the issue you raised, it should not be a major concern. According to the regulations of the Atomic Energy Commission, X-ray machines and lead doors must have an interlock system. This means that the X-ray machine cannot be activated when the lead door...

[Read More] Understanding the Impact of Accidental X-Ray Exposure in Radiology


Understanding Radiation Risks in Pediatric Heart Disease Treatments

Radiation from CT Scans and Cardiac Catheterization in Infants with Congenital Heart Disease Hello Dr. Yeh, My daughter was diagnosed with congenital heart disease (absence of the right pulmonary artery) right after birth. At just 5 days old, she underwent a cardiac CT angiogra...


Dr. Ye Weicheng reply Radiology
Dear Great Mom, The harmful effects of ionizing radiation on human health can be categorized into deterministic effects and stochastic effects. Deterministic effects refer to harmful tissue reactions resulting from excessive radiation exposure; as the dose increases, the severit...

[Read More] Understanding Radiation Risks in Pediatric Heart Disease Treatments


Understanding Radiation Exposure from Full Spine X-rays in Adolescents

Radiation dose from a full spine X-ray examination? Hello! My daughter is 15 years old and has undergone two full-body spinal X-ray examinations in the past year and a half (from the neck to the pelvis). The first examination included one frontal and one lateral view of the entir...


Dr. Ye Weicheng reply Radiology
Dear Concerned Mother, We have a more authoritative printed report dated March 2019, supported by the ACR (American College of Radiology) and RNSA (Radiological Society of North America). The authors reviewed the radiation doses to the human body from radiological examinations o...

[Read More] Understanding Radiation Exposure from Full Spine X-rays in Adolescents


Understanding X-Ray Radiation Risks in Children: What Parents Should Know

Childhood X-ray radiation concerns? Hello Dr. Yeh, 1. When my child was nearly 1 year old, he was diagnosed with laryngomalacia, and the doctor recommended a "neck and head X-ray." Initially, the father held the baby for the X-ray, but the baby was scared and cried con...


Dr. Ye Weicheng reply Radiology
When performing X-ray imaging of the head and neck in infants and young children, radiologic technologists generally reduce the radiation dose significantly due to the incomplete development of their tissues. Of course, advancements in technology have led to the incorporation of ...

[Read More] Understanding X-Ray Radiation Risks in Children: What Parents Should Know


Understanding Radiation Exposure: Risks and Measurements in Medical Procedures

Radiation dose The radiation dose from cardiac catheterization with ablation in 2012 varies based on the specific procedure and equipment used, but it typically ranges from 5 to 30 millisieverts (mSv). The radiation dose for a neck and head CT scan in the same year is generally a...


Dr. Ye Weicheng reply Radiology
Ans1: Cardiac catheterization is a procedure that involves fluoroscopic imaging, and the radiation dose does not have a fixed value; it depends on the duration of radiation exposure at the time. Typically, the dose ranges from 7 to 15 millisieverts, but if the physician's pr...

[Read More] Understanding Radiation Exposure: Risks and Measurements in Medical Procedures


Safety Concerns of Metal Dental Implants During MRI Scans

MRI Metal Issues Hello, doctor. Due to temporomandibular joint (TMJ) dysfunction, my doctor has arranged for me to undergo an MRI for further examination. I would like to ask if there are any safety concerns regarding the metal posts that were placed in the crowns of three teeth ...


Dr. Ye Weicheng reply Radiology
Metal dental implants do not pose safety concerns when entering an MRI room, so there is no need to worry. As for whether they will affect the examination results, generally they do not, unless the area being examined coincides with the location of the dental implant.

[Read More] Safety Concerns of Metal Dental Implants During MRI Scans


Understanding Radiation Risks from Frequent CT Scans: What You Need to Know

Radiation Issues with Computed Tomography (CT) Scans Hello, Doctor. In September 2018, I was diagnosed with a salivary gland tumor, and I underwent a CT scan of the head and neck with contrast, as well as a chest X-ray, in preparation for surgery. Later, in December 2018, another...


Dr. Ye Weicheng reply Radiology
The harmful effects of ionizing radiation on human health are divided into deterministic effects and stochastic effects. Deterministic effects refer to harmful tissue responses resulting from exposure to excessive radiation; as the dose increases, the severity of the damage also ...

[Read More] Understanding Radiation Risks from Frequent CT Scans: What You Need to Know


Can CT Contrast Agents Be Used with Low Blood Pressure?

Can a contrast agent be administered for a CT scan in patients with low blood pressure? Due to the side effects of Parkinson's medication, I cannot stop taking it. My average blood pressure is 90/60. Is it safe to use contrast agents for a CT scan? Could there be serious con...


Dr. Ye Weicheng reply Radiology
The use of contrast agents may cause hypotension, so it is important to monitor blood pressure changes when administering contrast agents to patients with low blood pressure. Hypotensive shock is one of the potential side effects of contrast agents, but it does not occur in every...

[Read More] Can CT Contrast Agents Be Used with Low Blood Pressure?


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 Radiology
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?


Impact of Frequent X-Ray Exposure on Menstrual Cycle and Fertility

The radiation exposure from X-rays? Hello Director Wang: I would like to ask you about the X-rays I had. Since February, I have had two knee X-rays, one chest X-ray after surgery in March, and after experiencing recurrent lower back pain in April, I had another X-ray at the rehab...


Dr. Ye Weicheng reply Radiology
Although you received five X-ray exposures over the past three months, the radiation dose from diagnostic X-rays is extremely low. Therefore, the health effects from radiation exposure are probabilistic in nature, and the probability is very low. This will not affect your menstru...

[Read More] Impact of Frequent X-Ray Exposure on Menstrual Cycle and Fertility


Understanding Health Insurance Coverage for MRI Scans in Taiwan

Health insurance reimbursement issues? Hello Doctor, I would like to ask again. If several tests have been conducted without identifying the cause, but the symptoms are very evident, and the hospital states that further MRI examinations must be paid out-of-pocket, I would like to...


Dr. Ye Weicheng reply Radiology
MRI is a high-cost examination that requires clinical symptoms or evidence that justify the need for the MRI scan before a clinician will agree to order it (otherwise, it may be rejected by the National Health Insurance Administration). Allowing patients to pay out-of-pocket firs...

[Read More] Understanding Health Insurance Coverage for MRI Scans in Taiwan


Can CT Scans Accurately Diagnose ENT and Brain Tumors?

Computed Tomography (CT) Scan Hello, if there is a suspicion of tumors related to the ear, nose, and throat, or deep-seated brain tumors such as pituitary adenomas or nasopharyngeal tumors, can a CT scan provide an accurate diagnosis? Thanks.


Dr. Ye Weicheng reply Radiology
Current multi-slice computed tomography (CT) can perform post-processing to generate images in axial, coronal, and sagittal planes. For pituitary or craniopharyngioma tumors, the administration of contrast agents during multi-slice CT can reveal the location, size, and shape of t...

[Read More] Can CT Scans Accurately Diagnose ENT and Brain Tumors?


Impact of Dental Metal on MRI Brain Imaging: What You Need to Know

MRI Metal Issues Hello, doctor. I need to undergo an MRI of the brain, but I recently had jaw surgery and have a fixed metal dental brace. I'm unsure if this will affect the clarity of the MRI images. I consulted with the imaging department, but they weren't very certai...


Dr. Ye Weicheng reply Radiology
Magnetic resonance imaging (MRI) utilizes a powerful magnetic field to produce images. Common artifacts caused by metallic objects include the creation of black spots or distortion of the images. However, the extent of interference with image quality depends on the type of materi...

[Read More] Impact of Dental Metal on MRI Brain Imaging: What You Need to Know


Impact of UV Sterilizers on Fetal Health: Safety Guidelines for Expecting Mothers

The impact of ultraviolet (UV) dish sterilizers on fetuses? Hello doctor, I am currently pregnant and would like to ask if being close to a UV disinfection machine while it is in use, or opening the door during its operation, could affect the fetus? What distance would be conside...


Dr. Ye Weicheng reply Radiology
Ultraviolet (UV) radiation is electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays. The shorter the wavelength of electromagnetic waves, the higher their energy and greater their penetrating power. For example, X-rays can penetrate the huma...

[Read More] Impact of UV Sterilizers on Fetal Health: Safety Guidelines for Expecting Mothers


Understanding Early Pregnancy Termination Options in Taiwan

Abortion I'm pregnant, but I cannot continue with this pregnancy. It's only two to three weeks along. Can I use injectable medication? Or is there a way to let it pass naturally? Are there hospitals in Changhua County that can assist with this? Thank you.


Dr. Ye Weicheng reply Radiology
Hello, regarding the issue you mentioned, it is advisable to consult an obstetrician-gynecologist for a response.

[Read More] Understanding Early Pregnancy Termination Options in Taiwan