Fixed show too light or too dark. The

Fixed tube current: the CT image not like conventional radiographic
imaging, the CT image never looks over exposed in the sense of show too light
or too dark. The CT data ensures that the image always appears properly
exposed. The CT radiographers are not technically forced to decrease the tube
current time product (mAs) for small patients who may result in excess
radiation dose for these patients. The radiographer should be provided with
proper guidelines for (mAs) selection as a function of patient size, thickness
and weight. However, radiographers are usually standardized the tube potential
(kV) and gantry rotation time (s) for a given clinical application. The fastest
rotation time should be used to minimize head motion artifact and blurring. The
lowest kV regular with the patient head size should be selected to provide a
maximize image contrast with low radiation dose.

One of the technical Pitfalls of CT is the use of ionizing
radiation. However, the normal radiation dos age for a routine brain CT scan is
between 2 and 5 mSv, it is important to note that radiation dose is increase
with increase scan phases. Care must be taken to reduce exposure factor KVP,
MAS and scan time when imaging patients and ALARA (As low as reasonably
achievable) principle should be applied in all situations to patients and
personnel. With the advent of MDCT, CTP and CTA, the benefit must be work
against the increased radiation doses connected with these techniques.

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Use
iterative reconstruction to provide an efficient image quality with less
radiation dose. Use eye protection shield to protect eye lenses. To reduce or
avoid eye exposure by radiation, the scan angle should be parallel to
supraorbital ridge and the inner table of the posterior margin of the magnum
foramen. This may be done by two ways first by tilting the patient is chin
toward chest or second way by tilting the CT gantry. (Adult
Routine Head Ct Protocols Version 2.0 3/1/2016, 2017) This will
reduce radiation dose value affecting the eye and reduce image noise due to the
soft tissues of lower part brain Appear without superimpose with orbit bone.

 

The most
effective way to reduce radiation dose is to avoid performing the examination
or reduce number of brain scan phases as possible and with repeated imaging
there is increase in radiation dose. Reducing Radiation Exposure during the
Scan as possible, that to find the sweet spot between the lowest exposures
appropriate for the brain while still providing a strong diagnostic quality images
for examination.