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Myocardial perfusion studies suffer from artifacts caused by misalignment of the transmission and emission data due to the influences of voluntary and involuntary patient motion. Regardless of 68Ge or respiratory-averaged CT based attenuation correction and good patient cooperation, approximately 21% of perfusion studies exhibit artifacts arising from misalignment that cannot be corrected by ma...

PURPOSE The purpose of this study is to compare digital radiography systems using the metric effective detective quantum efficiency (eDQE), which better reflects digital radiography imaging system performance under clinical operating conditions, in comparison with conventional metrics such as modulation transfer function (MTF), normalized noise power spectra (NNPS), and detective quantum effici...

Organ dose is the absorbed radiation energy from ionizing radiation to an organ, divided by the organ mass. Organ doses of a patient cannot be measured directly in the patient, but their determination requires dose measurements in anthropomorphic patient models i.e. phantoms or Monte Carlo simulations. Monte Carlo simulations can be performed for example by using computational phantoms or patie...

The analytical anisotropic algorithm (AAA) was implemented in the Eclipse (Varian Medical Systems) treatment planning system to replace the single pencil beam (SPB) algorithm for the calculation of dose distributions for photon beams. AAA was developed to improve the dose calculation accuracy, especially in heterogeneous media. The total dose deposition is calculated as the superposition of the...

Although a rare entity, chondrosarcoma is the most common malignant tumor of the chest wall. Most patients present with an enlarging, painful anterior chest wall mass arising from the costochondrosternal junction. CT scan with intravenous contrast is the gold standard radiographic study for diagnosis and operative planning. Contrary to previous dictum, resection may be performed in an appropria...

Rigidity of the thorax in ankylosing spondylitis was first recognized as long ago as 1695, when Bernard Connor described a skeleton showing the characteristic rigidity of the thoracic cage and lumbar spine and concluded that respiration must have been greatly restricted during the life of the unfortunate sufferer. This astute observation remained the only one of its kind until Hilton Fagge (187...

We are now about half way through our term of office (unless we are prematurely fired for terminal misbehaviour); here we review where we are, and where we are going, and have the first instalment of the showcase of some of our best articles from last year. We have maintained our second position with an improved impact factor (6.84) over 2011, we continue to attract very high quality manuscript...