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What's the difference between CT and MRI?

Computed Tomography, or CT Scan, uses tomography radiation to create images. The hallmark is that it is fast, fits emergency cases such as accidents, brain bleeding, or looking at the lungs, but will have radiation exposure.

Magnetic Resonance Imaging, or MRI, uses magnetic fields and radio waves, no radiation, providing very detailed images suitable for looking at the brain, nerves and tissues, but takes longer to examine and requires lying still.

# ctscan # mri # Healthy with lemon # Medical equipment

4 days agoEdited to

... Read moreจากประสบการณ์ส่วนตัวที่ได้ตรวจ CT และ MRI มา ต้องบอกว่าแต่ละเทคนิคมีข้อดีและข้อจำกัดที่แตกต่างกันชัดเจนมาก ก่อนอื่น CT Scan เป็นเครื่องมือที่ให้ภาพรวดเร็วมาก เหมาะกับกรณีฉุกเฉินอย่างการกระทบกระเทือนทางสมองหรือเกิดเลือดออกในสมอง เช่นตอนที่มีอุบัติเหตุ ซึ่งความเร็วนี้ช่วยในการวินิจฉัยและตัดสินใจรักษาได้ทันที อย่างไรก็ตามการตรวจ CT ใช้รังสีเอกซเรย์ จึงต้องระวังเรื่องการได้รับรังสีสะสมถ้าตรวจบ่อย ในขณะที่ MRI ไม่ใช้รังสีแต่ใช้สนามแม่เหล็กและคลื่นวิทยุ ให้ภาพที่มีรายละเอียดเนื้อเยื่อชัดเจนกว่ามาก เหมาะกับการตรวจสมอง เส้นประสาท และกล้ามเนื้อ รวมถึงอวัยวะภายในที่ต้องการความละเอียดสูง เช่น ตับและไขสันหลัง แต่การตรวจจะใช้เวลานาน และต้องนอนนิ่งตลอดเวลา ซึ่งบางคนอาจรู้สึกอึดอัดหรือกลัวอุโมงค์ MRI นอกจากนี้ MRI ยังสามารถแยกรายละเอียดของรอยโรคต่างๆ ได้ดีจนช่วยให้แพทย์วางแผนการรักษาได้แม่นยำมากขึ้น เช่น การแยกแยะเนื้องอกกับเนื้อเยื่อปกติ ขณะที่ CT จะเห็นโครงสร้างกระดูกได้ชัดกว่า ช่วยในกรณีที่ต้องตรวจหากระดูกแตกหรือความผิดปกติของโครงกระดูก สุดท้ายแล้วการเลือกว่าจะใช้ CT หรือ MRI ขึ้นอยู่กับอาการและการวินิจฉัยเบื้องต้นของแพทย์ เพราะแต่ละเทคนิคเหมาะกับการตรวจคนละลักษณะโรคกัน หากสงสัยว่าควรตรวจแบบไหน ควรปรึกษาแพทย์เพื่อให้ได้การวินิจฉัยที่แม่นยำและปลอดภัยที่สุดสำหรับแต่ละบุคคล

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