When a doctor recommends a scan, it is not unusual for patients to feel uncertain – or even apprehensive. Medical imaging is one of those areas where misconceptions tend to circulate freely, and not all of them are harmless. Some myths lead patients to delay important scans. Others cause unnecessary anxiety before an appointment. A few even prompt people to decline imaging their doctor has recommended.
At RRD Imaging, we see the impact of these misconceptions regularly. Patients arrive with questions shaped by things they have heard from friends, read online, or assumed based on a previous experience from years ago. This article addresses the most common misunderstandings about medical imaging directly – so you can approach your next scan informed rather than anxious.
Misconception 1: All Medical Scans Expose You to Harmful Radiation
This is one of the most persistent myths in medical imaging, and it is partly rooted in a misunderstanding of how different scans work.
X-rays and CT (computed tomography) scans do use ionising radiation, but the doses involved in standard diagnostic imaging are very low – far below the threshold at which any harm to healthy tissue would occur. To put it in perspective, the radiation from a single chest X-ray is comparable to the natural background radiation a person absorbs over a few days simply by living on Earth.
MRI (magnetic resonance imaging) scans use no radiation at all. They work by using powerful magnetic fields and radio waves to produce detailed images of soft tissues, joints, and organs. Ultrasound also involves no radiation – it uses sound waves.
Radiographers in Australia are trained to follow the ALARA principle – ‘As Low As Reasonably Achievable’ – to ensure every patient receives the minimum dose necessary to produce a diagnostic image. Radiation protection is not an afterthought; it is built into every imaging protocol.
Misconception 2: You Need a Referral for Every Type of Scan
The referral process for medical imaging varies depending on the type of scan and what it is being used for. While many scans – particularly MRI and CT – do require a referral from a general practitioner or specialist to access Medicare rebates, the specific process is not as rigid as many patients assume.
Some types of imaging can be accessed without a specialist referral in certain circumstances. Your GP is the right starting point if you are concerned about a symptom, but it is worth knowing that referrals can also come from a range of practitioners including physiotherapists, chiropractors, and dentists, depending on what is being scanned.
The most important thing is not to put off speaking to a healthcare provider because you assume the process will be complicated or inaccessible. A conversation with your GP is usually straightforward, and most GPs can issue a referral quickly when imaging is clinically appropriate.
Misconception 3: Medical Imaging Is Painful or Uncomfortable
Most medical imaging procedures are entirely non-invasive and involve no physical discomfort at all. X-rays, ultrasounds, and most CT scans require patients to hold still for a brief period while the image is captured. There is nothing inserted, injected, or physically applied to the body during these scans.
MRI scans are slightly different in that they take longer and require patients to lie inside a tunnel-shaped machine while the images are being acquired. The machine produces loud clicking and knocking sounds, which can be startling if you are not expecting them. Patients are provided with earplugs or headphones to reduce noise, and imaging staff remain in communication throughout.
Some scans use a contrast agent – typically an injectable dye – to improve image clarity. This is administered by a qualified health professional and is used only when clinically necessary. Patients are always informed in advance if contrast is required, and any relevant health factors (such as allergies or kidney function) are checked beforehand.
If you have any concerns about a specific procedure, speaking with the imaging team before your appointment is always an option. Staff at imaging centres are accustomed to explaining procedures to anxious patients and can walk you through exactly what to expect.
Misconception 4: A Scan Will Immediately Give You the Answers
One of the most common sources of frustration for patients is the expectation that a scan will produce an instant diagnosis. In reality, medical imaging is one part of a larger diagnostic process.
After your scan, images are reviewed by a radiologist – a medical doctor who specialises in interpreting imaging results. The radiologist prepares a written report, which is sent to the referring doctor or specialist. Your treating doctor then combines the imaging findings with your clinical history, symptoms, and any other test results to form a diagnosis.
This process usually takes a day or two, though urgent scans may be reported sooner. It means that even if you finish your scan and feel like everything went smoothly, you will typically need to follow up with your referring doctor to discuss the results – rather than receiving an outcome at the imaging centre.
The role of the radiologist is specialist and clinical, not administrative. Their report is an important part of your care, even if it is not the final step in understanding your health.
Misconception 5: If the Scan Looks Normal, Something Has Been Missed
A normal scan result is a meaningful result. Some patients assume that because they still have symptoms, a normal scan must mean something was overlooked. This is rarely the case.
Medical imaging is one diagnostic tool among many. Certain conditions – particularly early-stage or functional problems – may not produce visible changes on a scan. In those situations, your doctor will consider other investigations, clinical assessments, or monitoring over time to understand what is happening.
Imaging technology has also advanced considerably. Modern equipment produces highly detailed images that are reviewed by trained radiologists. The chance of a significant finding being overlooked is far lower than many patients fear.
If you receive a normal result but still have concerns, the right course of action is to discuss those concerns with your doctor – not to assume the imaging process failed.
Misconception 6: MRI Is Dangerous for People with Metal Implants
It is true that MRI machines generate a very strong magnetic field, and certain types of metal implants can be affected by that field. However, the blanket assumption that metal implants mean you cannot have an MRI scan is not accurate.
Many modern implants – including titanium joint replacements, dental crowns, and certain surgical clips – are MRI-compatible and present no risk during imaging. The safety of any implant in an MRI environment depends on its specific composition, size, and position in the body.
Before an MRI, all patients are required to complete a safety screening process that asks about any implants, surgical procedures, or metallic foreign bodies. Imaging staff review this information carefully and will consult with relevant sources – including the implant manufacturer’s specifications and RANZCR (Royal Australian and New Zealand College of Radiologists) guidelines – to determine whether the scan is safe to proceed.
If an MRI is genuinely not appropriate for you, your doctor and the imaging team will discuss alternatives to ensure you still receive the diagnostic information you need.
Misconception 7: You Can Self-Refer for Any Scan You Think You Need
Patients sometimes search for scans they believe they need based on symptoms they have researched online. While it is understandable that people want answers quickly, requesting specific scans without clinical guidance can lead to imaging that is either not the right type for the suspected condition, or not clinically indicated at all.
In Australia, the referral pathway exists to ensure that imaging is appropriate for each individual patient. Your GP or specialist is trained to identify which type of scan will provide the most useful diagnostic information for your specific situation. An X-ray, for example, is effective for bones and certain chest conditions, but would not provide the soft tissue detail that an MRI or ultrasound offers.
If you believe you need a scan, speaking with your GP is the most efficient path. Most GPs are well-placed to assess the clinical picture, issue a referral if appropriate, and guide you towards the right type of imaging. This process typically takes one appointment – not weeks.
Misconception 8: You Have to Travel Far to Access Quality Imaging
For patients in the northern Brisbane corridor, access to quality medical imaging is closer than many assume. Our North Lakes imaging clinic provides a range of diagnostic imaging services for patients across the region – including those in Mango Hill, Murrumba Downs, Dakabin, and surrounding suburbs.
Quality imaging does not require a long drive to a major hospital or city centre. Community-based imaging clinics are staffed by qualified radiographers, supported by experienced radiologists, and equipped with modern technology. The standard of care available locally is the same as you would receive in a larger facility.
If you have been putting off a scan because you assumed it would involve a complicated or inconvenient process, it may be worth checking what is actually available close to home.
Understanding Medical Imaging Helps Patients Make Better Decisions
Many of the fears patients carry into an imaging appointment are based on outdated information, generalisations, or concerns that apply to a different type of scan altogether. When patients understand what a procedure actually involves, they tend to be more comfortable, better prepared, and more likely to follow through with the imaging their doctor has recommended.
Medical imaging plays a critical role in identifying conditions early, monitoring known health issues, and guiding treatment decisions. Delays caused by avoidance – whether due to fear of radiation, uncertainty about the process, or anxiety about the outcome – can have real consequences for health.
If you have questions about an upcoming scan, the imaging team at RRD Imaging is available to help. Getting accurate information before your appointment is always a good starting point.
Disclaimer: The information provided in this article is intended for general educational purposes only and does not constitute medical advice. Each patient’s circumstances are individual, and the appropriateness of any imaging procedure should always be assessed by a qualified healthcare professional. If you have concerns about a specific scan or your health, please consult your general practitioner or treating specialist.
