A computerized tomography (CT) scan of the head is an imaging test that is sometimes used to confirm a brain tumor diagnosis. This noninvasive procedure involves taking a series of X-rays from many different angles.
A CT scan, or computed tomography, is often the first imaging test you will receive. It is fairly quick and can show many abnormalities of the brain. Because certain tumors are hard to see with a CT scan, some people also will receive an MRI, or magnetic resonance imaging, of the brain or spine.
You usually have a CT scan of the brain to help diagnose a brain tumour. It can help to find where the tumour is and whether it has spread.
Generally, CT scans are better at spatial resolution, while MRIs are better at contrast resolution. That means CT scans are good at showing us where the edges of things are — where this structure ends and that other one begins.
It's important to note that some cancers may be overlooked on a CT scan. Lesions may be missed for a variety of reasons, including location and human error. Still, CT is more sensitive than a simple X-ray. A CT scan can find lesions as small as 2-3 mm.
In most cases, a CT scan is sufficient to rule out a large brain tumor. However, in cases where CT scan detects an abnormality or if your doctor thinks that you have enough signs and symptoms which need more detailed scanning, he/she might order an MRI.
Where MRI really excels is showing certain diseases that a CT scan cannot detect. Some cancers, such as prostate cancer, uterine cancer, and certain liver cancers, are pretty much invisible or very hard to detect on a CT scan. Metastases to the bone and brain also show up better on an MRI.
MRI scans use magnetic fields and radio waves to produce images. An MRI scan of the head produces a detailed image of the brain and brain stem.
MEG is the most advanced and accurate functional brain imaging technique currently available. It is also non-invasive, painless and quiet. MEG works by measuring the very weak magnetic fields in the brain, associated with the brain's electrical activity (neuronal firing).
Common symptoms of brain tumours include headaches, feeling or being sick and seizures (fits). These symptoms and the others listed below are often caused by other medical conditions. But if you have any of them, it's important to see your doctor.
Diagnosing a brain tumor usually involves a neurological exam, brain scans and a biopsy, if it can be done safely. A neurological exam may include a variety of tests to evaluate neurological functions such as balance, hearing, vision and reflexes.
For persons exposed to a single CT scan before the age of 20 years, the risk of brain cancer was 43% greater than for unexposed (see Table 2); this corresponds to an ERR of 0.43 (0.18–0.73). For those who received 3 or more scans (3–7 scans), the ERR was 3.7 (1.83–6.8).
Blood tests are not used to diagnose brain or spinal cord tumours. However, they are routinely done to provide a baseline before any planned treatment. They can provide helpful information about your general health, how other organs are functioning, other medical conditions and the possible risks of treatment.
A CT of the brain may be performed to assess the brain for tumors and other lesions, injuries, intracranial bleeding, structural anomalies (e.g., hydrocephalus , infections, brain function or other conditions), particularly when another type of examination (e.g., X-rays or a physical exam) are inconclusive.
The average cost of a brain CT scan can range between $825 to $4,800, while a brain MRI cost tends to range from $1,600 to $8,400 on average.
CT Scan (Computed Tomography)
An X-ray image of the head, processed by a computer into two- and three-dimensional images of the skull and brain. A CT scan can show the presence of an aneurysm and, if the aneurysm has burst, detects blood that has leaked into the brain.
A CT scan is often used to diagnose head injuries because it can show the extent of any damage to the brain. By looking at a CT scan image, doctors can identify any evidence of bleeding, swelling, or skull fractures.
MRIs are a lot more detailed than CT scans and provide much more information. This makes it the headache imaging type of choice for those needing a diagnosis of sub-acute or chronic symptoms.
Brain imaging can reveal unsuspected causes of your anxiety. Anxiety can be caused by many things, such as neurohormonal imbalances, post-traumatic stress syndrome, or head injuries. Brain scans can offer clues to potential root causes of your anxiety, which can help find the most effective treatment plan.
CT scanning is painless, noninvasive, and accurate. A major advantage of CT is its ability to image bone, soft tissue, and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many types of tissue as well as the lungs, bones, and blood vessels.
CT scans often miss soft tissue injuries and other abnormalities. An MRI may or may not detect these. Some TBIs can take time to develop. A microscopic brain bleed or nerve fiber damage might not occur for hours or even days, long after you've visited the emergency room.
Chronic back pain or an injury to the spine are among the most common reasons to have a CT scan. A doctor may also order a spinal CT scan to: Evaluate spinal fractures. Assess the condition of the spine before and after surgical procedures.
A CT scan is better for showing bone and joint issues, blood clots, and some organ injuries, while an MRI is better for inflammation, torn ligaments, nerve and spinal problems, and soft tissues. Beyond accuracy, patient comfort is also a variable your doctor will keep in mind.