Magnetic Resonance Imaging (MRI)2023 updated fully solved

Magnetic Resonance Imaging (MRI)2023 updated fully solvedMagnetic Resonance Imaging (MRI) - correct answer Uses a powerful magnet and radiowaves to create images, does NOT use Ionizing Radiation. Magnetic Field - correct answer Flows down axis of open ended tube Radiowaves - correct answer Emitted in pulses perpendicular to Magnetic field by Radiofrequency coil. MRI function - correct answer Patient tissue absorbs energy, then releases this energy in form of radiowaves which are received/absorbed by receiver coil. Different tissues emit different energies giving Different Signals! MRI Advantages - correct answer Can adjust number and frequency of pulses, yielding better resolution and detail (especially of soft tissues) than other techniques. Echotime (Te) - correct answer Time at which energy signals are received following pulse Repetition time (Tr) - correct answer Repeat pulse, repeat signal reception/time. T1 Weighted Image - correct answer Short Te, Short Tr: Capable of visualizing fat best, necessary to fat suppress image for better diagnostic value. Soft tissue=grey. Fluid, Air, Fat=Black. T2 Weighted Image - correct answer Long Te, Long Tr. Shows fluid best. Fluid Build up is result of tissue damage, hence, shows Tissue Damage best. Proton density weighted image - correct answer Te short, Tr long. Reveals dense tissue well: Cartilage, Tendons-"Joint Pain" MRI Image - correct answer Composed of Axial (Transverse) slices of voxels(attentuate and emit e-mag radiowaves): 3D, can be reconstructed to yield 2D. MRI Disadvantages - correct answer Most expensive, patient must lie still 30-60min. Electronic devices/metal implants are adversely affected. MRI Visualization - correct answer Looking feet to head with patient supine (on his back looking up)