Elimination of artifacts through spatial reconstitution in thoracic aorta imaging examination
Journal Title: Αρχεία Ελληνικής Ιατρικής - Year 2009, Vol 26, Issue 3
Abstract
OBJECTIVE The purpose of this study was to record streak artifacts appearing in chest imaging examinations and also to evaluate the possibility of eliminating or minimizing them through spatial reconstruction, for better visualization of the thoracic aorta. Streak artifacts are very common as examinations are performed with the use of IV contrast medium injection in high concentrations (350-370 mgI/mL), at injection rates of higher than 4 mL/sec and a fast scan time of the area of interest. METHOD A spiral CT (Philips 5000 SR) was used, with a scan time of 1.5 seconds per rotation and 40 chest examinations were included in the study, which were selected randomly during the program, whenever the images contained artifacts that could simulate pathology. An experienced radiologist selected the cases, and an experienced radiographer applied the spatial resolution. Two experienced radiologists performed quality evaluation in a double-blind study and four different image categories were created, according to the improvement of image quality. RESULTS In the first category (no improvement) were classified 17.5% of the cases namely none of the processed images improved with the spatial reconstruction method (less than 10% compared to the initial images). In the second category (slight improvement) were classified 35% of the cases. The scoring rate was better by a percentage of 11-35% compared to the initial images. In the third category (substantial improvement) were classified 27.5% of the cases. The scoring rate was better by a percentage of 36-70% compared to the initial images. In the fourth category (significant improvement) were classified a 25% of the cases. The scoring rate was better by a percentage of 71-100% compared to the initial images. CONCLUSIONS Spatial reconstruction, when applied to chest CT examinations, improves the quality of the image and contributes to the derivation of more accurate conclusions. This process for the correction of streak artifacts is suggested not only for safety reasons but also because it is difficult for an examination to be repeated on the same day due to the maximum dose of the contrast medium received.
Authors and Affiliations
E. LAVDAS, V. ROKA, G. PROTOGEROU, M. VLYCHOU, I. FEZOULIDIS
Keywords
Related Articles
- EP ID EP139394
- DOI -
- Views 74
- Downloads 0
The elastic properties of arteries and methods for their assessment
This review summarizes the methods used to estimate arterial stiffness, the factors and diseases that influence arterial stiffness and the effects of drugs and interventions on the elastic properties of the arteries. Art...
Chemoprophylaxis and the consumption of antibiotics in surgical practice
OBJECTIVE Surgical site infections (SSI) remain among the main causes of postoperative morbidity, prolonging hospitalization and increasing the cost of medical treatment in surgical units. In the present study the consum...
Zenker's diverticulum presented with chronic dry cough and recurrent pulmonary infections
A 76-year-old male presented chronic dry cough, recurrent pulmonary infections and dysphagia. Cervical computed tomography (CT) and esophagogram revealed an intermediate-sized Zenker's diverticulum in the posterior wall...
Acute kidney injury in patients with cirrhosis of the liver
In recent years important steps have been made in understanding the pathogenesis of acute renal failure in liver cirrhosis. In particular, the implications of renal dysfunction on the prognosis of the underlying disease...
Assessment of thyroid function<br /> in chronic hemodialysis patients aged over 50 years <br /> <br />
OBJECTIVE Thyroid function abnormalities are common in chronic hemodialysis (HD) patients and their incidence increases with age. The signs and symptoms are rarely suggestive and are easily confused with those of end sta...