Discuss the parallels between the evolution of Xray based mo

Discuss the parallels between the evolution of X-ray based modalities X-rays to CT, and the evolution of electron microscopy modalities TEM to SEM.

Solution

While MRI and X-ray are both imaging techniques for organs of the body, the difference is that MRI images provide a 3D representation of organs, whichX-Rays usually cannot.

Comparison chart

MRI versus X-ray comparison chart
MRI X-ray
Radiation Exposure
None. MRI machines do not emit ionizing radiation. Exposure to dangerous ionizing radiation.
Application
Suited for Soft tissue evaluation, e.g., ligament and tendon injury, spinal cord injury, brain tumors, etc. X-Rays are largely used to examine broken bones. Can also be used to detect diseased tissues.
Effects on the Body
No biological hazards have been reported with the use of MRI. However, some may be allergic to the contrast dye, which is also inappropriate for those suffering from kidney or liver disorders. The powerful rays have the ability to create birth defects and diseases and can also alter the

2.

Advantages of TEMs over SEMs

A TEM might be used in preference to an SEM because:

Transmission Electron Microscopes can produce images that have

Higher Magnification and
Greater Resolution

than images produced by Scanning Electron Microscopes.

Advantages of SEMs over TEMs

An SEM might be used in preference to a TEM because:

Scanning Electron Microscopes produce three-dimensional (3D) images while Transmission Electron Microscopes only produce flat (2D) images.

3D images provide more information about the shape of features and also about the location of features relative to each other. In some situations this information is very useful and more important than the higher resolution and magnification that a TEM would provide.