A 62-year-old female patient undergoes a DEXA scan. Her T-score at the femoral neck is -2.6, and her Z-score is -1.2. The scan was performed at the spine, femur, and radius. Apply your understanding of DEXA metrics and ROI selection and answer the following questions:1.     INTERPRET the clinical significance of the T-score and Z-score results. (4)2.     JUSTIFY the choice of ROIs used in this scan for assessing fracture risk and osteoporosis progression. (3)

Which statement correctly differentiates calibration phantoms from imaging phantoms?

A radiology department completes all scheduled QC tests and consistently records equipment performance within established tolerance limits. However, management rarely reviews QC reports, quality indicators are not analysed, and QA procedures have not been updated for several years. Which conclusion is most justified?

A hospital manager suggests eliminating the daily CT number and image noise tests because the scanner has consistently passed all QC tests for the past year. Which evaluation is most appropriate?

A deep contaminated wound creates a low-oxygen environment in which bacterial spores germinate. Toxin produced locally then travels by retrograde axonal transport to the CNS. Which organism is responsible?

Which of the following features is characteristic of the anaerobe Clostridium bacteria?

Which gram-positive, catalase-positive species is commonly associated with skin and mucous membrane infections and post-surgical complication of prosthetic device?

A radiographer is performing Test 49: Scan Plane Localization from Alignment Lights as part of the department’s quarterly CT quality control programme. The aim is to verify that the CT laser alignment lights accurately indicate the selected scan position. Which procedure would be most appropriate to ensure a valid assessment of scan localization accuracy?

What is a major virulence factor associated with Haemphilus influenzae?

A bacterial colony growing on blood agar is surrounded by a greenish zone rather than complete clearing. How should this reaction be classified?