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Answer updated on: 10 Feb 2020
May suggest need for a Collis gastroplastyA: A non-reducible hiatal hernia implies a short esophagus and may require a modification of the planned surgery (Collis gastroplasty) or esophageal lengthening procedure but it can still be performed laparoscopically.B: Post-operative dysphagia is usually due to improper surgical technique such as an overly long or tight fundoplication. C: In the ...
Answer updated on: 10 Feb 2020
Positioning flexibilityA: Incorrect. CR typically exhibits lower detection effiency and lower detective quantum efficiency (a measure of the information transfer from the input x-rays to the information content of the output image) chiefly due to thinner screens (compared to CsI structured phosphors) or lower atomic number (compared to Gd2O2S screens : Gd Z=53 versus BaFBr CR screens : Br ...
Answer updated on: 10 Feb 2020
It increases intrinsic efficiency. A: A thicker crystal will have worse intrinsic spatial resolution since the scintillation light will spread out more before detection by the photomultiplier tubes and also there is a greater possibility of multiple scatter events but will have better efficiency in capturing incident radiation. B: A thicker crystal will have worse intrinsic spatial resolution ...
Answer updated on: 10 Feb 2020
Blount diseaseA: The majority of cases of Blount disease are bilateral. B: Physiologic genu varus has a gentle distal femoral and proximal tibial medial metaphyseal beaking and the apex of curvature is at the knee joint line. For infantile Blounts disease the apex of curvature is along the proximal tibia and metaphyseal beaking is more angulated with metaphyseal fragmentation. C: For infantile ...
Answer updated on: 10 Feb 2020
Absence of urease in mammalian cellsA: Correct. The basis of this study is that the Helicobacter pylori bacteria present in the stomach in patients with this infection contain the enzyme urease necessary for the breakdown of urea. This metabolism of C-14 labeled urea results in the formation of C-14 labeled CO2 gas which is then detected using a liquid scintillation counter. In the absence of ...
Answer updated on: 10 Feb 2020
Superior longevityA: Artcriovenous fistulas have superior longevity compared to synthetic grafts. 85% versus 50% at two years. Longevity is the key. Excluding a successful transplant these patients will require dialysis for the rest of their lives. And access sites are limited. Infection and central vein thrombosis preclude a policy of long-term maintenance dialysis through tunneled central vein ...
Answer updated on: 10 Feb 2020
Patent ductus arteriosusFindings: There is a vascular structure connecting the inferior aspect of the posterior aortic arch and the main pulmonary artery consistent with a patent ductus arteriosus.A: The image shows a connection between the posterior aortic arch and the main pulmonary artery consistent with patent ductus arteriosus. In truncus arteriosus there is a single great vessel which is ...
Answer updated on: 10 Feb 2020
Absent pericardiumFindings: Contrast-enhanced CT of the chest reveals lung tissue interposed between the aorta and the main pulmonary artery. Because this area is intrapericardial (superior pericardial recess) this finding can only be seen in the absence of the pericardium.A: Pulmonary agenesis refers to the absence of the lung and its bronchial and vascular supply. In the setting of pulmonary ...
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