By Suzanne Henwood
Scientific CT: ideas and perform goals to provide radiographers operating in CT usually a longer wisdom of CT protocols and the way they need to be tailored to optimise photograph caliber. It makes use of suitable scientific examples to illustrate the benefits of the urged innovations, which can no longer but be in use in all hospitals. It covers all however the such a lot infrequent of pathologies and should for this reason additionally function an invaluable unmarried reference for the busy radiographer.
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Prone coronal imaging is preferable to head-hanging supine coronal imaging as patient immobilisation is much better. Supplementary techniques Axial imaging – using scanning factors and algorithms similar to the coronal protocol, may sometimes be required to fully delineate tumours and is essential in the evaluation of Wegener’s granuloma. If coronal images have been obtained, a 5 mm slice width 28 and increment is adequate for the axial images. If however coronal positioning has been impossible, axial images should be obtained at 3 mm slice and increment, from the alveolar process of the maxilla to the upper limit of the frontal sinus, with a gantry angle parallel to the RBL.
A lateral scan projection radiograph should be used. A lateral scan projection radiograph must be performed. 14. Only five or six sections will be taken, reducing the dose to the patient by at least half as the mAs used is also substantially reduced. 41) Indications 1. To identify aneurysms of the Circle of Willis in patients presenting without a subarachnoid haemorrhage. Examples are 3rd and 6th cranial nerve palsies often accompanied by pain. The protocol is also used in very elderly patients presenting with subarachnoid haemorrhage, when formal angiography may not be a serious option but a diagnosis is needed.
These views should demonstrate the contrast medium within the spinal subarachnoid space. 17. AXIAL SCANS • If an apparently complete block to the cranial flow of contrast has been demonstrated 5 mm contiguous sections should be performed in a cranial direction, from the normal appearances below the block. It is usually possible to detect some contrast that has passed the block and thus determine the upper limit of the lesion when the normal spinal cord is again visualised. 16 — CT myelography. Thoracic spine: contrast in spinal subarachnoid space; normal appearances.