Concerns About Radiation Exposure During Abdominal CT Preparation - Radiology

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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 preparation phase.
Is there any radiation exposure during this time? On that day, for some reason, when I was supposed to receive the contrast agent after the scan, my veins kept collapsing, and I had to ask the nurse to reinsert the needle.
My veins collapsed three times, so I went through the preparation phase (exhaling, holding my breath, and then scanning) three times.
I'm a bit concerned about whether there was any radiation exposure during those three scans.

Z, 30~39 year old female. Ask Date: 2023/02/19

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 of professionals to ensure a smooth examination.
If you experience any abnormal symptoms after leaving the hospital, it is advisable to return to the emergency department or consult your original treating physician for further evaluation.
Please take this into consideration, and I wish you safety and good health.

Reply Date: 2023/02/19

More Info


When it comes to concerns about radiation exposure during the preparation phase of an abdominal CT scan, it's important to clarify a few key points. During the preparation phase, which typically involves instructions to hold your breath and may include preliminary scans, there is generally no radiation exposure unless an actual scan is being conducted.
In the context of your experience, the steps you described—holding your breath and performing preparatory actions—are standard procedures to ensure that the images obtained during the actual scan are clear and accurate. These preparatory steps do not involve radiation exposure. Radiation is emitted only during the actual imaging process when the CT scanner is actively taking pictures of your abdomen.

Regarding your concern about the saline injections and the multiple attempts to insert an IV, it's understandable to feel anxious, especially after experiencing discomfort. However, the preparatory scans you underwent before the injection of the contrast agent do not contribute to your radiation exposure. The radiation dose from a typical abdominal CT scan is approximately 8-14 mSv, depending on the specific protocol used and the equipment. This dose is significant, but it is important to remember that medical imaging is performed with the understanding that the benefits of accurate diagnosis often outweigh the risks associated with radiation exposure.

In terms of cumulative radiation exposure, while it's true that multiple scans can add up, the doses from preparatory scans (if they were indeed scans) are typically much lower than the full CT scan dose. For instance, a standard X-ray may expose a patient to about 0.1 mSv, which is significantly less than a CT scan. Therefore, if you underwent three preparatory scans that were not full CT scans, the radiation exposure would still be minimal compared to the actual CT scan.

It's also worth noting that the risk of developing cancer from radiation exposure from medical imaging is very low, especially when the doses are below 100 mSv, according to the International Commission on Radiological Protection (ICRP). The risk of radiation-induced cancer from a single abdominal CT scan is estimated to be about 1 in 2,000 to 1 in 10,000, depending on various factors including age and sex.

If you have ongoing concerns about radiation exposure or the necessity of the scans you underwent, it is advisable to discuss these with your healthcare provider. They can provide personalized information based on your medical history and the specific reasons for the imaging studies. Additionally, if you experience any unusual symptoms following the procedure, do not hesitate to seek medical advice.

In summary, the preparatory phase of your abdominal CT scan should not have involved any radiation exposure, and the actual imaging process, while it does involve radiation, is justified by the need for accurate diagnosis. Always feel empowered to ask questions about your medical procedures and the associated risks, as informed patients are better able to participate in their healthcare decisions.

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