R_Bibb_Medical_Modelling_The_Application_of_Adv.pdf

22 Medical modelling
2.13 A typical MR image through the abdomen.
have attached or implanted devices that may be adversely affected. As with
CT scanning, movement will lead to distorted images, and babies, small
children and claustrophobic patients may require sedation or anaesthesia.
MR scanners also generate an enormous amount of noise, which even with
ear protection is not pleasant for the patient.
Although the MR does not utilise ionising radiation it may present a risk
for certain patients. MR scans are time consuming and expensive, so every
care must be taken to ensure that the scan is conducted correctly the fi rst
and only time. It is also important to consider the dangers that any magnetic
metal implants may have before conducting MR scans.
2.3.2 Anatomical coverage
As with any radiographic procedure, basic mistakes can be made through
poor communication between the clinician and radiographer. Detail can be
lost when the scans do not cover the whole anatomy of interest or do not
include suffi cient margins surrounding the anatomy of interest. Detail may
also be lost by using a fi eld of view that is too small. When conducting