Imaging techniques play a significant role in the evaluation of diseases related to the brain and nervous system. While brain MRI helps examine the brain’s structural characteristics, advanced MRI techniques used when necessary can provide more detailed answers to various clinical questions.
At the Brain Imaging and Neuroscience Unit of NPİSTANBUL Hospital, imaging methods such as 3 Tesla MRI, functional MRI, diffusion MRI, DTI, MRI spectroscopy, perfusion MRI, and volumetric brain MRI may be used as clinically indicated.
The appropriate imaging method is determined on a case-by-case basis for each patient. The treating physician selects the appropriate method based on the patient’s symptoms, physical examination findings, and the specific medical condition being investigated.
What Is the Brain Imaging and Neuroscience Unit?
The Brain Imaging and Neuroscience Unit is a field where imaging methods used in the evaluation of brain and nervous system disorders are considered in conjunction with clinical findings.
Neuroscience is the scientific field that studies how the brain works and the relationship between brain functions and thought, memory, behavior, movement, and emotions. For this reason, brain imaging can be evaluated in conjunction with various specialties such as neurology, psychiatry, neurosurgery, and radiology.
Brain imaging methods can be used for the following purposes, depending on the patient’s condition:
- To investigate whether there are any structural changes in the brain,
- To assist in the evaluation of a specific disease,
- To examine the location and characteristics of brain lesions,
- To contribute to treatment or surgical planning when necessary,
- To monitor changes during the course of the disease.
Imaging results alone do not constitute a diagnosis. Findings are evaluated in conjunction with the patient’s physical examination, clinical history, and other necessary tests.
What Are the Methods of Brain Imaging?
The method used for brain imaging varies depending on the patient’s symptoms and the clinical condition being investigated. While a standard brain MRI may be sufficient for some patients, in certain cases, advanced MRI techniques may be required.
The primary MRI methods and applications used in brain imaging are as follows:
- Magnetic Resonance Imaging (MRI)
- 3 Tesla MRI
- Functional MRI (fMRI)
- Diffusion MRI and DTI
- MR spectroscopy
- Perfusion MRI
- Volumetric Brain MRI Analysis
Magnetic Resonance Imaging (MRI)
Magnetic Resonance Imaging (MRI) is one of the radiological imaging methods that allows for detailed visualization of brain and nervous system structures.
MR does not use ionizing radiation. A brain MRI may be ordered by a physician to investigate the causes of neurological symptoms, evaluate changes in brain tissue, or monitor a known condition.
Brain MRI is particularly used for:
- Brain tumors,
- cerebrovascular diseases,
- Demyelinating diseases such as multiple sclerosis,
- Certain structural changes associated with epilepsy,
- Infections and inflammation,
- Changes in memory and cognitive function
can be used in the evaluation of these conditions.
The same MRI protocol is not used for every patient. The scope of the scan is determined based on the patient’s clinical condition.
What Is a 3 Tesla MRI?
A 3 Tesla MRI refers to the strength of the magnetic field of the MRI scanner. It allows for the use of certain advanced MRI techniques in addition to standard MRI examinations for imaging the brain and nervous system.
With 3 Tesla MRI, depending on clinical need:
- Standard brain MRI,
- Functional MRI,
- Diffusion MRI and DTI,
- MRI spectroscopy,
- Perfusion MRI,
- Volumetric brain MRI
can be utilized.
A 3-Tesla MRI does not mean that all advanced techniques will be used for every patient. The decision regarding which examination is necessary is based on the patient’s clinical needs.
Functional MRI (fMRI)
Functional MRI (fMRI) is one of the advanced MRI techniques that helps assess which regions of the brain become active during specific tasks.
Functional MRI can be used specifically to evaluate brain regions associated with speech, movement, and certain cognitive functions.
In selected patients, it can help assess the relationship between lesions and brain areas responsible for important functions, particularly prior to brain surgery.
Functional MRI is also used in research in the fields of neuroscience and psychiatry. However, it does not, on its own, diagnose a psychiatric disorder.
Diffusion MRI and DTI
Diffusion MRI is a specialized MRI technique that helps evaluate certain changes in brain tissue. It is one of the imaging techniques frequently used, particularly in cases of suspected acute stroke.
DTI (Diffusion Tensor Imaging), on the other hand, helps evaluate the white matter tracts formed by the brain’s neural connections.
DTI is particularly useful for:
- Assessing the relationship between brain lesions and nerve pathways,
- Examining neural connections in certain neurological disorders,
- Assisting with surgical planning when necessary
.
MR Spectroscopy
MR spectroscopy is an advanced MR technique that, in addition to standard MR images, provides information about certain metabolic changes in brain tissue.
It can be used specifically to provide additional information to standard MRI in the evaluation of certain brain tumors and brain lesions.
MR spectroscopy results alone do not establish a diagnosis. The findings are evaluated in conjunction with standard MR images and the patient’s clinical condition.
Perfusion MRI
Perfusion MRI is an imaging method that helps assess the blood flow characteristics of brain tissue.
It can be used particularly in cases of certain brain tumors, cerebrovascular diseases, and when a more detailed evaluation of changes observed on standard MRI is required.
Whether perfusion MRI is performed and which method is used is determined based on the patient’s clinical condition.
Volumetric Brain MRI Analysis
Volumetric brain MRI analysis is an imaging method that helps measure the volumes of specific regions of the brain.
It can provide additional information, particularly in the evaluation of memory problems and cognitive changes, for patients where it is deemed necessary.
In the evaluation of Alzheimer’s disease and other neurodegenerative diseases, volumetric MRI results can be considered in conjunction with clinical findings and neuropsychological tests.
Volumetric MRI alone does not establish a diagnosis of disease.
What Are Advanced Brain MRI Techniques Used For?
Advanced brain MRI techniques are used to seek answers to specific clinical questions beyond what standard brain MRI images can provide.
Each method provides different information:
- Functional MRI: Helps evaluate brain regions associated with specific functions.
- DTI: Enables the examination of neural pathways in the brain.
- MRI Spectroscopy: Provides information about certain metabolic changes in brain tissue.
- Perfusion MRI: Evaluates blood flow to brain tissue.
- Volumetric MRI: Helps measure volume changes in specific regions of the brain.
Advanced MRI techniques can be used particularly in cases of brain tumors, epilepsy, cerebrovascular diseases, neurodegenerative diseases, and certain conditions requiring surgical planning.
Not every patient needs advanced MRI. The physician determines whether a standard MRI is sufficient or if additional imaging is necessary.
For Which Conditions Is Brain Imaging Used?
Brain imaging methods can be used to evaluate various neurological conditions.
The main areas of application are as follows:
- Brain tumors,
- Stroke and other cerebrovascular diseases,
- Epilepsy,
- Multiple sclerosis,
- Alzheimer’s disease and other types of dementia,
- Parkinson’s disease and other neurodegenerative diseases,
- Brain infections,
- Traumatic brain injury,
- Hydrocephalus,
- Changes in memory and cognitive function.
An MRI is not necessary for every complaint of headache, forgetfulness, dizziness, or numbness. The need for brain imaging is determined by evaluating the patient’s symptoms and physical examination findings.
How Is Brain Imaging Used in Psychiatry?
The diagnosis of psychiatric disorders is primarily based on a detailed psychiatric evaluation, the patient’s history, and a mental status examination.
Brain MRI, 3 Tesla MRI, or other advanced imaging methods alone cannot diagnose depression, bipolar disorder, schizophrenia, anxiety disorders, or any other psychiatric illness.
However, certain psychiatric symptoms may be caused by an underlying neurological or other medical condition. For this reason, brain imaging may be requested in some patients to aid in differential diagnosis.
Brain imaging may be considered particularly in the following situations:
- Noticeable changes in personality or behavior that were not present before,
- New-onset psychiatric symptoms in older adults,
- Noticeable memory or cognitive decline,
- The presence of accompanying neurological symptoms,
- A history of seizures,
- A history of head trauma.
Functional MRI and other advanced brain imaging techniques are also used in psychiatric and neuroscience research. However, these methods do not replace clinical evaluations.
Brain Imaging in Neurological Diseases
Brain imaging in neurological disorders can be used to investigate the cause of the disease, evaluate changes in the brain, and monitor the disease process when necessary.
Different imaging methods may be preferred depending on the disease:
- In stroke: Methods such as diffusion MRI may be utilized.
- Brain tumors: In addition to standard MRI, perfusion imaging, spectroscopy, DTI, or functional MRI may be used.
- In epilepsy: Brain MRI may be ordered to investigate whether there is a structural cause.
- In multiple sclerosis: Brain MRI and, when necessary, spinal cord MRI may be used.
- In Alzheimer’s disease and other types of dementia: Structural and, when necessary, volumetric imaging may be used.
Imaging results are interpreted in conjunction with other clinical data, such as neurological examinations, laboratory tests, EEG, or neuropsychological evaluations.
How Is the Brain Imaging Process Conducted?
The brain MRI process typically begins with a physician’s evaluation. The imaging method is determined based on the patient’s symptoms and physical examination findings.
In general, the process proceeds as follows:
1. A physician evaluation is performed.
The need for brain imaging is determined by evaluating the patient’s symptoms and medical history.
2. The appropriate MRI method is selected.
It is determined whether a standard brain MRI is sufficient or if advanced imaging techniques are needed.
3. An MRI safety check is performed.
The patient is asked whether he has a pacemaker, metallic implants, or similar medical devices. If the patient is pregnant or suspects he may be pregnant, he must inform the healthcare team.
4. The imaging procedure is performed.
The patient is positioned appropriately inside the MRI scanner. To ensure clear images, the patient must remain as still as possible during the scan.
In some advanced MRI procedures, the patient may be asked to perform specific tasks.
The duration of the scan may vary depending on the method used and the imaging protocol.
How Are Brain Imaging Results Interpreted?
Brain MRI images are evaluated by a radiologist, who prepares a radiology report.
If advanced imaging techniques were used, the report may also include additional findings based on the method applied. For example:
- nerve pathways with DTI,
- blood flow characteristics using perfusion MRI,
- Metabolic changes with MR spectroscopy,
- Brain regions associated with specific functions via functional MRI,
- Volumetric MRI to assess volume changes in brain regions
can be assessed.
The MRI report is then interpreted by the physician following up on the patient, in conjunction with clinical findings.
Not every change seen on an MRI indicates a disease. Similarly, a normal MRI result does not mean that all neurological or psychiatric disorders have been ruled out.
Therefore, imaging results must be evaluated not in isolation, but in consideration of the patient’s overall clinical condition.
Technologies Used at the NPİSTANBUL Brain Imaging and Neuroscience Unit
At the NPİSTANBUL Hospital Brain Imaging and Neuroscience Unit, both standard and advanced brain MRI techniques can be utilized depending on the patient’s clinical needs.
MRI-based imaging applications available in the unit include:
- 3 Tesla MRI
- Standard brain MRI
- Functional MRI (fMRI)
- Diffusion MRI
- Diffusion Tensor Imaging (DTI)
- MRI Spectroscopy
- Perfusion MRI
- Volumetric brain MRI analysis
may be included.
The choice of imaging technique depends on the patient’s symptoms and the clinical question to be addressed. Not all imaging methods need to be performed on every patient.
After the brain imaging results are evaluated by a radiologist, they are considered in conjunction with clinical findings from neurology, psychiatry, neurosurgery, and other relevant specialties when necessary.
The information on this page is for general informational purposes only. The need for brain imaging, the method to be used, and the clinical significance of the results are evaluated by the treating physician, taking the patient’s individual health status into account.
