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CT vs MRI | Medical Science Optional Notes for UPSC PDF Download
Advantages of MRI over CT
- Absence of radiation exposure
- Superior soft tissue resolution, facilitating clearer visualization of the spinal cord, tendons, and menisci
- Functional perspective, with Functional MRI extending imaging capabilities beyond structural assessment
- Elimination of the need for iodinated contrasts, reducing the risk of anaphylaxis
- Absence of bone artifacts
- Generation of more detailed images
- Enhanced sensitivity and specificity for brain abnormalities
- Visualization of vessels without the reliance on contrast agents
- Ability to perform imaging in any plane without requiring the patient to move
Advantages of CT over MRI
- More cost-effective and widely employed
- Enhanced visualization of skeletal structures
- Quicker imaging process
- Absence of issues related to claustrophobia
- Effective in detecting acute bleeds
- Optimal for visualizing calcific lesions
- Availability of electron density information for dosimetry
- Utilization of cortical bone information to generate digitally reconstructed radiographs (DRR)
- Presence of metallic foreign bodies does not pose a contraindication
Medical Imaging Repeats
- What is the principle of ultrasound? In which medical conditions, it is almost diagnostic? (2013)
- Discuss in brief about the role of USG in the management of Liver abscess. (2019)
- What are the principles of Echocardiography? What is its diagnostic significance? (2017)
- Discuss the principles of magnetic resonance imaging (MRI). In which conditions, has its better diagnostic value than computerized tomography (CT) scan? (2016)
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FAQs on CT vs MRI - Medical Science Optional Notes for UPSC
| 1. What are the advantages of MRI over CT? |  |
Ans. MRI offers the following advantages over CT:
- MRI provides more detailed and accurate images of soft tissues, such as organs, muscles, and nerves, making it superior for diagnosing conditions in these areas.
- MRI does not use ionizing radiation, which makes it safer for patients, especially those who require multiple scans or children.
- MRI is better at detecting certain conditions, such as brain tumors, spinal cord injuries, and joint problems.
- MRI can provide better contrast between different tissues, allowing for clearer visualization of abnormalities.
- MRI can produce images in multiple planes, providing a more comprehensive view of the body part being scanned.
| 2. What advantages does CT have over MRI? | |
Ans. CT offers the following advantages over MRI:
- CT scans are generally faster than MRI scans, making them more suitable for patients who cannot remain still for long periods.
- CT can provide detailed images of bones and bone structures, making it particularly useful for evaluating fractures, osteoporosis, and bone tumors.
- CT can be performed on patients with certain implants or pacemakers, whereas MRI may not be feasible in such cases.
- CT is less sensitive to motion artifacts, making it more suitable for patients who are unable to lie still during the scan.
- CT scans are more readily available and often more cost-effective compared to MRI scans.
| 3. How is MRI better than CT for diagnosing brain tumors? | |
Ans. MRI is superior to CT for diagnosing brain tumors due to the following reasons:
- MRI provides more detailed and precise images of the brain, allowing for better visualization of tumor size, location, and characteristics.
- MRI can differentiate between different types of brain tumors, aiding in accurate diagnosis and treatment planning.
- MRI can detect smaller tumors and identify their extent, including their infiltration into surrounding brain tissues.
- MRI can provide better visualization of the blood vessels within and around the tumor, helping in surgical planning and avoiding damage to critical structures.
- MRI can monitor the response to treatment over time by detecting changes in the tumor's size and characteristics.
| 4. Why is MRI safer than CT for repeated scans or children? | |
Ans. MRI is safer than CT for repeated scans or children because:
- MRI does not use ionizing radiation, unlike CT, which reduces the risk of potential harm associated with radiation exposure.
- Children are more sensitive to the effects of radiation, and repeated exposure to CT scans may increase their long-term cancer risk. MRI eliminates this concern.
- MRI uses a strong magnetic field and radio waves to generate images, which are considered safe and non-invasive.
- The absence of radiation in MRI allows for repeated scans without the cumulative risk of radiation exposure.
- MRI technology has advanced to minimize the need for sedation or anesthesia in children during the scanning process, further enhancing safety.
| 5. In what scenarios is CT more suitable than MRI? | |
Ans. CT is more suitable than MRI in the following scenarios:
- When there is a need for rapid imaging, such as in emergency situations or with patients who are unable to lie still for an extended period.
- When evaluating suspected bone fractures, bone tumors, or conditions related to the skeletal system, as CT provides detailed images of bones.
- When a patient has certain implants, such as metal or electronic devices, that may interfere with MRI but are compatible with CT scanning.
- When there is a need to assess lung conditions, such as pulmonary embolism or lung cancer, as CT scans can capture detailed images of the lungs.
- When cost-effectiveness or accessibility is a significant factor, as CT scanning is often more readily available and relatively less expensive compared to MRI.
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Dec 31, 2024 Last updated |
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