X-Ray Radiation Safety in Ajax: Understanding the Dose

“Every X-ray adds up, so I should avoid them whenever I can.” It is one of the most common things people say when a health-care provider orders imaging, and it comes from a reasonable place. Radiation is invisible, the word itself sounds alarming, and most of us never learned much about it in school.

The real picture is more reassuring and more nuanced. Medical X-rays do use ionizing radiation, and imaging teams take that seriously. At the same time, a standard diagnostic X-ray uses a low dose, the exam is short, and it is only ordered when a provider believes the information it gives is worth having. This article explains what “dose” means in plain language, how imaging teams in clinics like ours in Ajax keep exposure as low as reasonably possible, and what questions are worth asking if you still feel uneasy.

Nothing here replaces a conversation with your own doctor or health-care provider. Think of it as background so that conversation is easier.

Radiation is part of everyday life

The first thing that helps put medical imaging in perspective is that everyone is exposed to small amounts of natural radiation all the time. It comes from the ground and building materials, from the air we breathe, from space, and even from naturally occurring elements in food and in our own bodies. This is called background radiation, and it varies a little depending on where you live and how much you travel by air.

Health organizations often compare the dose from a medical test to background radiation because it gives people a familiar reference point. For many common X-rays, such as an image of an arm, a hand, a foot or the chest, the dose is often described as comparable to a relatively short period of everyday natural exposure. Exams of larger or denser parts of the body generally use more, and CT scans, which take many images from different angles, use considerably more than a single plain X-ray.

The key idea is that “radiation” is not all-or-nothing. It is about how much, how often and to which part of the body.

What “dose” actually means

When imaging professionals talk about dose, they are thinking about a few things at once:

• How much energy the X-ray beam carries and how long it is on. For a plain X-ray, the exposure lasts only a fraction of a second.
• How much of the body is in the beam. A tightly focused image of a finger exposes far less tissue than an image of the abdomen.
• How sensitive the tissue is. Some tissues, and children’s growing bodies in general, are more sensitive to radiation than others.
• How many images are taken. Most exams involve two or more views so the provider can see a structure from different angles.

You do not need to know the units or the numbers to make sense of your own situation. What matters is that a diagnostic X-ray is designed to use the smallest amount of radiation that still produces a clear, useful image.

The principle behind every exposure: as low as reasonably achievable

Imaging teams across Canada work by a principle often shortened to ALARA, which stands for “as low as reasonably achievable.” It shapes how X-rays are ordered, taken and repeated.

Justification

Before an X-ray is taken, someone has decided it is worth doing. Your health-care provider orders it because the expected benefit, such as finding out whether a bone is broken or checking the lungs, outweighs the small risk from the dose. If you are ever unsure why a test was ordered, it is completely reasonable to ask your provider what they hope to learn from it.

Optimization

Once an X-ray is justified, the technologist works to get the best image with the least exposure. In practice that looks like:

• Careful positioning, so the image is right the first time and does not need to be repeated
• Collimation, which narrows the beam to the area being examined so surrounding tissue is not exposed
• Exposure settings adjusted to the body part and the patient, including smaller settings for children
• Clear instructions to hold still or hold your breath for a moment, because movement blurs the image

Digital imaging helps

Rossland Diagnostic Clinic in Ajax captures radiographs digitally. Digital systems allow images to be reviewed quickly and shared electronically with the physician who ordered them, and they let the technologist confirm right away that an image is clear. That reduces the chance of a patient being called back for a repeat.

About lead aprons and shields

Many people remember being draped in a heavy lead apron at the dentist or during an X-ray years ago, and they are surprised when they are not offered one today. Practices around patient shielding have changed over time as equipment has become more precise. Modern X-ray beams are tightly focused, and in some situations a shield can actually get in the way of the image or cause the machine to adjust its settings, which may mean a repeat exposure.

Imaging teams follow current professional guidance on when shielding is helpful and when it is not. If you have a question about it, ask the technologist. They are used to the question and happy to explain what they are doing and why.

Pregnancy and X-rays

If there is any chance you might be pregnant, tell the technologist before the X-ray is taken. This is a standard question in imaging departments, not a sign that anything is wrong.

Many X-rays, such as images of the hands, feet or chest, do not aim the beam at the abdomen. Even so, your health-care provider and the imaging team will want to know so they can weigh the benefits and consider options. Sometimes a different test may be appropriate. For example, ultrasound uses sound waves rather than radiation, which is one reason it is used routinely in pregnancy. In other cases an X-ray is still the right choice, and the team will take appropriate steps.

The important thing is to share the information and let your provider guide the decision. Please do not skip or delay a test your provider has recommended without talking it over with them first.

Children and X-ray safety

Parents in Ajax and across Durham Region often feel especially cautious about imaging for children, and that instinct is understandable. Children are more sensitive to radiation than adults, which is exactly why imaging teams pay close attention to settings and positioning for younger patients.

Some things that help:

1. Ask your child’s provider why the X-ray is needed and what it is likely to show. Knowing the reason often eases the worry.
2. Prepare your child. Tell them a large camera will take a picture of the inside of their body, and that it does not hurt. The hardest part is staying still.
3. Bring a comfort item such as a small toy or blanket for after the exam.
4. Mention previous imaging. If your child has had X-rays of the same area before, let the provider know so they can consider whether past images are useful.

If you have had several X-rays

People with long-term conditions, sports injuries or a history of fractures sometimes worry about the “running total.” A few practical points:

• Each exam is assessed on its own merits. Your provider orders an X-ray because they believe it will help with a decision now.
• Keep track of where you have had imaging. If previous images exist, your provider may be able to use them for comparison, which can sometimes reduce the need for extra views.
• Ask for a copy when you are being referred. The clinic can provide images on CD when required, which can help a specialist see earlier results.
• Raise your concerns. If you are anxious about cumulative exposure, tell your provider. They can explain how they weigh it in your situation.

Avoiding a needed X-ray carries its own risk: a fracture that is missed or a chest problem that goes unrecognized can lead to more trouble than the small dose involved in the test.

Imaging tests that use little or no radiation

Not every imaging test uses X-rays. It can help to know the general differences, while remembering that your provider chooses the right test for the question they are trying to answer:

• Ultrasound uses sound waves and no ionizing radiation. It is excellent for soft tissues, organs, blood vessels and pregnancy, but it cannot see through bone well.
• Bone mineral density testing uses a low-energy X-ray technique to measure bone strength, typically at the hip and spine.
• Mammography uses low-dose X-rays designed specifically for breast tissue.
• Plain X-ray remains one of the fastest and most widely used ways to look at bones and the chest.

Each has strengths. One is not simply “safer” than another in every situation; they answer different questions.

Questions worth asking

If you would like to feel more confident before your exam, these are fair questions to bring to your health-care provider or the imaging team:

• What are you hoping to find out from this X-ray?
• Would a different test answer the same question, and why or why not?
• I might be pregnant. How does that change things?
• I have had X-rays of this area before. Are those images useful?
• Do I need to remove anything, and is shielding appropriate for this exam?

You are allowed to ask. Good imaging care includes explaining what is being done and why.

For patients across Ajax, Pickering and Whitby, our walk-in X-ray service is open Monday to Friday 9:00am to 5:00pm and Saturday 8:00am to 3:30pm, though the department may close once daily capacity is reached. If you have a question about your exam or would like to check availability, call Rossland Diagnostic Clinic at 905-426-3111. For scheduled tests such as ultrasound, you can also request an appointment online.