The need for radiation-free, detailed, and high-resolution imaging in medical diagnostic processes is met by magnetic resonance imaging (MRI) technology, one of the most significant achievements of modern medicine. MRI is considered the gold standard in the early diagnosis and treatment follow-up of many diseases by imaging the body's soft tissues with unparalleled clarity. Especially in fields requiring precise evaluation of soft tissues, such as neurology, orthopedics, and oncology, MRI continues to be the most trusted imaging method for physicians.
What is Magnetic Resonance Imaging?
MRI is an imaging method that measures the behavior of hydrogen atoms in body tissues using a strong magnetic field and radio waves, converting this data into detailed images. Since it does not use X-rays, it contains no radiation. It provides a resolution far superior to other imaging methods in distinguishing soft tissues. In addition to classical anatomical imaging, advanced techniques such as functional MRI, diffusion, perfusion, and spectroscopy allow for the evaluation of diseases at the molecular level. Modern MRI devices keep patient comfort at the highest level with wide gantry openings and low-noise technology.
Working Principle
Hydrogen atoms in the body of a patient entering the MRI device are aligned within a strong magnetic field. Radio waves are sent to temporarily displace these atoms from their alignment; the signals they emit while returning to their original state are processed by computer software and converted into high-resolution images. During the scan, various sequences are applied to reveal different tissue properties. Different sequences such as T1, T2, and FLAIR are each sensitive to different pathologies; therefore, a comprehensive MRI examination includes multiple sequences.
In Which Diseases Is It Used?
MRI has a wide range of applications in almost every field of medicine:
- Neurology: Stroke, multiple sclerosis, brain tumors, epilepsy
- Oncology: Tumor diagnosis, staging, and monitoring of treatment response
- Orthopedics: Meniscus, cartilage, ligament, and tendon injuries
- Spinal diseases: Disc herniation, spinal cord pathologies
- Women's health: Breast MRI, pelvic masses, endometriosis
- Cardiology: Heart muscle, valve, and vascular evaluation
- Abdominal organs: Liver, pancreas, kidney diseases
- Pediatrics: Preferred choice for children as it contains no radiation
- Ear, nose, and throat diseases: Inner ear and pituitary evaluation
- Vascular diseases: Contrast-free vascular examination with MR angiography
Advantages of MRI
MRI has many unique advantages among modern imaging methods:
- No radiation: Contains no ionizing radiation; can be preferred for children and pregnant women.
- Soft tissue superiority: Highest resolution in brain, spine, joint, and organ imaging.
- Multi-planar examination: Cross-sections can be obtained from any angle.
- Functional evaluation: Blood flow and tissue metabolism can be measured.
- Early diagnosis: Detects lesions that cannot be seen with other methods.
- Treatment follow-up: Objective monitoring of treatment response.
- Contrast-free vascular imaging: Special sequences like MR angiography are available.
- Wide clinical use: Can be applied in almost every medical field.
- Advanced techniques: Molecular information via diffusion, perfusion, and spectroscopy.
How Does the Examination Process Proceed?
Before the MRI, a detailed history of the patient is taken. Specifically, it is questioned whether there are any metal implants, pacemakers, cochlear implants, or brain aneurysm clips in the body. For patients with a history of claustrophobia, sedation or wide-gantry devices may be preferred. In pediatric patients, anesthesia support is planned when necessary.
Scanning Phase
The patient is placed in a supine position on the MRI table. During the scan, loud knocking sounds come from the device; headphones or earplugs are provided to prevent discomfort. It is critical for the patient to remain still for image quality. The scan duration varies between 15 and 60 minutes depending on the examination. When necessary, a gadolinium-based contrast agent is administered intravenously. In pediatric patients, the scan can be performed under anesthesia if required.
Evaluation of Results
The obtained images are examined in detail by a radiologist, reported, and forwarded to the relevant branch physician. Based on the findings, further examination, treatment, or surgical planning can be performed. The course of the disease is evaluated by comparing it with previous examinations.
Points to Consider
There are some critical points that patients and their relatives should pay attention to before an MRI scan:
- The presence of metal implants or electronic devices in the body must be reported.
- Pacemakers, cochlear implants, and certain insulin pumps must be questioned for MRI compatibility.
- Gadolinium allergy or advanced kidney failure must be disclosed in advance.
- In case of pregnancy, a special evaluation is made with the physician.
- Metal accessories, credit cards, and magnetic cards must be left outside before the scan.
- Sedation can be planned in advance for patients with a history of claustrophobia.
- Anesthesia support is provided for pediatric patients when necessary.
- Hair dye, tattoos, and permanent makeup status should be reported to the technician.
- Some dental treatments and screws placed in the bone should be communicated to the physician.
- Comfortable clothing should be preferred before the scan.
Functional and Advanced MRI Techniques
Beyond classical anatomical MRI imaging, functional MRI applications today offer revolutionary possibilities in medical diagnosis. Diffusion-weighted imaging allows for diagnosis within minutes in cases of acute stroke. Perfusion MRI is used to distinguish the viability of brain tumors and to differentiate between post-treatment recurrence and radiation necrosis. MR spectroscopy contributes to the differential diagnosis of tumor types by analyzing the chemical structure in tissues. Functional MRI provides critical information, especially in pre-surgical planning for epilepsy, by mapping brain activation.
Pediatric MRI Applications
In pediatric patients, MRI is the preferred cross-sectional imaging method because it does not contain radiation. MRI is an indispensable tool in the evaluation of congenital anomalies, childhood tumors, epilepsy, and neuroembryological developmental disorders. Since small children cannot remain still during long scan times, anesthesia support is provided when necessary. Modern fast sequences and child-friendly MRI environments have allowed us to take significant steps toward reducing the need for anesthesia.
As Koru Hospital, we offer our patients the highest level of diagnostic opportunities with our state-of-the-art magnetic resonance devices with high field strength and our experienced radiology team. Thanks to our wide-gantry design devices, we provide a comfortable environment where patients suffering from claustrophobia can also be examined easily. We are honored to be by your side to protect your health with our personalized protocols for every age group, especially children, women, and oncology patients, our multidisciplinary team approach, and our quality standards. Our most important goal is to provide the most accurate information to our physicians in the fields of neurology, orthopedics, oncology, cardiology, and gynecology using advanced MRI techniques and to contribute to the creation of the most appropriate treatment plans for our patients; we continue to be a reliable partner in your health journey by combining the possibilities of modern medicine with our patient-oriented approach.
