Low back pain has for long been associated with the lumbar spine biomechanics. A three dimensional model of segments L2 to L5 of lumbar spine is generated form CT images of a healthy human male. Hounsfield units of the image slices are used to derive material properties throughout the 3D model. This model is subjected to finite element analysis to study stresses developed during naturally found...

An obese 52-year-old woman underwent mitral valve replacement. On the first day after the operation, she had left-sided weakness. Brain CT showed right side middle cerebral artery infarction, and a hypodense filling defect was noted in the right distal internal carotid artery (figure, A). Region of interest measurement of CT density of the hypodense lesion was –83 Hounsfield units (figure, B), ...

IMAJ • Vol 2 • October 2000 G6PD and Israeli Spotted Fever 781 even with high current. A possible explanation may have to do with impaired conductivity through fat. A lipoma should be sought whenever a huge smooth polyp is identified in the descending colon. Further verification can be obtained with the help of CT, where there is a uniform hypodense polyp. On CT, absorption densities of -80 to ...

population aged > 50 years have renal cysts [5]. Most cysts are benign and asymptomatic. A palpable mass, pain from haemorrhage into the cyst, obstructive symptoms and infections are rare presentations. A simple cyst is a fluid-filled, non-neoplastic lesion; most are unilocular, contain straw-coloured fluid, arise from the cortex and are smooth-walled. On CT they are sharply marginated, round, ...

CT and MR imaging studies were performed in a 3-year-old boy with infantile fibromatosis arising from the infratemporal fossa and extending into the middle cranial fossa. On CT scans, the lesion was hyperattenuating (44-49 Hounsfield units [HU]), enhancing significantly after application of contrast material (63-66 HU). The MR images showed a multilobulated lesion of heterogeneous signal intens...

A 47-year-old male heavy smoker who was an ex-intravenous drugs user presented with gallstones; a preoperatived chest radiograph showed hazy opacity in the right lower lobe. Chest CT revealed in the lower posterior lobes two almost symmetrical areas of consolidation with fat attenuation values ( 50 Hounsfield units, figure 1). A broncholaveolar lavage did not provide pathological findings. A tr...

Results: The review of the literature yielded 15 studies on the effect of treatment options for osteoporosis on lumbar fusion rates. One study demonstrated an association between low bone mass as measured by Hounsfield Units and lower fusion rates. Six studies evaluated perioperative medical treatment of osteoporosis and showed higher fusion rates in patients treated with alendronate and teripa...

SUMMARY CT angiography (CTA) shows high sensitivity in detecting calcified plaques, but sometimes a bias in the exact quantification of stenosis degree occurs, mainly caused by the high linear attenuation coefficient of the calcified plaques. The purpose of this technical study was to evaluate the most appropriate CT window parameters for the assessment of calcified plaques stating which of the...

A 35-year-old woman presented after 5 months of increasingly severe dyspnea on exertion. Her physical examination and laboratory values were unremarkable. Chest radiography revealed cardiomegaly. Unenhanced chest computed tomography (CT) showed an enlarged left atrium with subtle central (12 Hounsfield units [HU]) and peripheral (21 HU) hypodensity (Fig. 1). Further characterization with contra...