Congress:
EuroSafe Imaging 2017
Keywords:
Dosimetry, CT-High Resolution, CT, Head and neck, Ear / Nose / Throat, Action 5 - Performance indicators for radiation protection management, Action 8 - Radiation protection training and learning material, Action 2 - Clinical diagnostic reference levels (DRLs), Action 9 - Development of criteria for safe imaging procedures, Action 6 - Education and training in medical radiation protection, Action 3 - Optimisation, diagnostic reference levels, image quality, Safety, Inflammation, Kv imaging
Authors:
N. I. Traykova, D. Kostova-Lefterova, K. Doykova, A. Petrova
DOI:
10.1594/esi2017/ESI-0013
Background/Introduction
Rhinosinusitis is the most commonly diagnosed illnesses of the paranasal sinuses.
It is defined as an inflammation of the nasal cavity and the mucous membranes of the sinuses,
sometimes with involving the underlying bone.
On the basis of the duration of symptoms three types of sinusitis are known: acute-symptoms persist less than 4 weeks,
subacute -4 to 12 weeks and chronic /with or without nasal polyposis/- symptom duration more than 12 weeks.
There are also another three subtypes- recurrent ,
complicated /with orbital or intracranial involving/ and allergic fungal sinusitis.
Diagnosing of rhinosinusitis will include the following: nasal endoscopy,
CT and MRI.
CT is the imaging study of choice in the evaluation of the nose and paranasal sinuses and is the gold standard for delineation of inflammatory sinus diseases resulting from obstruction.
Therefore we tried to establish an optimal very low-dose CT protocol for this area.
The dose was redused to protect the eye lens,
with no loss of image quality and no significant noice increase.
The kV setting was reduced from 120kV to 80kV and the mAs setting from 360mAs to 16mAs