52 ultrasonographic assessment (median nerve cross-sectional area, flattening ratio, transverse carpal ligament thickness and bulge) Results: Mean median nerve cross-sectional area was smaller than those for European studies due to personal factors such as race, body mass index and wrist circumference. Mean flattening ratio was greater than optimal threshold value at tunnel inlet and outlet. No significant difference between dependent and non-dependent hands was found. This study therefore provides insights into risk factors associated with development of adverse health effects related to various electronic devices used by students. 17.8. Phantom-based ultrasound quality assurance measurements in HUS Medical Imaging Centre Presenter: Mervi Jauhiainen, HUS Helsinki Medical Imaging Centre, Finland Author: Mervi Jauhiainen Introduction: The purpose of this lecture is to describe how phantombased ultrasound quality assurance measurements are arranged in HUS Medical Imaging Centre, Finland. Phantom-based measurements are part of the quality control protocol which has been used since 2010 at HUS Medical Imaging Centre. Measurements are useful both in evaluating technical quality of examinations and in optimizing the use of large amount of ultrasound scanners. Methods: Sonographers perform once a year phantom-based quality measurements to all ultrasound scanners. More limited condition inspection is also done quarterly. HUS Medical Imaging Centre has several locations with ultrasound scanners. Results: This coherent way of executing phantom-based ultrasound quality measurements has proved to be sufficient. Measurements are coordinated by ultrasound phycisist and sonographers perform them. At this moment there are twelve sonographers working in HUS Medical Imaging Centre. Phantom-based quality assurance measurements have become part of sonographer’s know-how and the measurements are more reliable and easier to perform, when they are done by experienced sonographers. 17.9. 3D Elastography Measurement of Neck Node Volume: System Development, In Vitro and In Vivo studies Presenter: Micahel Ying, Department of Health Technology and Informatics, The Hong Kong Polytechnic University Authors: M Ying, YP Zheng, BCW Kot, JCW Cheung, SCH Cheng Introduction: Assessment of neck lymph nodes is crucial for patients with head and neck cancer as it helps treatment planning and predicting prognosis. Ultrasound is a useful imaging tool for assessing neck nodes because of its high sensitivity and specificity when combined with fineneedle aspiration cytology. Measurement of nodal size is important in ultrasound assessment of neck nodes. In patients with head and neck cancers, increase in size of neck nodes in serial ultrasound examinations suggests metastases. With the availability of three-dimensional (3D) ultrasound, it allows measurement of lymph node volume which is accurate in nodal size assessment. However, lymph nodes with extracapsular spread demonstrate ill-defined borders on grey scale ultrasound which makes identification of nodal borders difficult and thus affects the accuracy and reliability of nodal size assessment. Elastography has been shown to have an advantage of better delineation of ill-defined lesions' borders. Therefore, this study aimed to integrate 3D ultrasound and elastography to develop a novel 3D elastography system, and to apply it in measuring the volume of ill-defined lymph nodes. Methods: Porcine lymph node volume was measured with 3D grey scale ultrasound and 3D elastography. Measurement accuracy and reliability of the techniques were compared. Patients with enlarged neck nodes were included to evaluate the measurement reliability. Conclusions: We developed a novel 3D elastography system for volume measurement of soft tissues. Lymph nodes that appeared ill-defined on grey scale ultrasound demonstrated well-defined borders on elastography. 3D elastography (84% and 91-99% respectively) has higher accuracy and reliability than 3D grey scale ultrasound (62% and 78-91% respectively) in volume measurement of ill-defined lymph nodes. 17.10. Case study on renal/suprarenal masses that cause spontaneous bleeding Presenter: Charles Omondi, Society of Radiography in Kenya Author: Charles Omondi Introduction: Oncocytes are epithelial cells with abundant, granular, eosinophilic cytoplasm due to presence of numerous large mitochondria of varied sizes. Oncocytes are seen in various organs like salivary glands, thyroid, parathyroid, pituitary, nasal cavities, sinuses, ocular caruncle, lacrimal glands, buccal mucosa, eustachian tube, larynx, esophagus and organs like liver, pancreas, and kidney.( Chakrabarti et al, 2012:80-82) Oncocytic adrenal neoplasms are very rare with 20 cases reported in world literature. All these reported cases were non-functional (no excessive hormone production) and found incidentally at autopsy or on radiological investigations (Goel et al, 2007:77-78). The objective of this case presentation is therefore to demonstrate the role of ultrasound in narrowing differentials in the diagnosis of renal masses that cause spontaneous bleeding in an adult patient. Methods: A case study was carried out on a 48 year old male out- patient at Hellen Joseph hospital in Johannesburg, South Africa. The patient was a newly diagnosed RVD (retroviral disease) case. The clinician referred the patient for sonography for the assessment of the kidneys to rule out or confirm pyelonephritis. Results: The right kidney appeared normal in size, shape and echo pattern. The left kidney, however, exhibited renal enlargement, abnormal shape and abnormal echo pattern. A 5cm sized mass with central hypo echoic area (? scar) was seen in the region of the upper mid-pole of the left kidney. A complex, generally hypoechioc area was seen in relation to the kidney, inferiorly. Diagnostic aspiration was carried out and 20 ml of clotted blood was aspirated, suggestive of hematoma.
ISRRT | Book Of Abstracts
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