The purpose is to review in a 4-part series: (i) the basic principles of x-ray production, (ii) x-ray interactions and data capture/conversion, (iii) acquisition/creation of the CT image, and (iv) operational details of a modern multislice CT scanner integrated with a PET scanner. Advances in PET technology have lead to widespread applications in diagnostic imaging and oncologic staging of dise...

Dual-energy CT is an imaging technique that has been known and extensively studied for many decades [1-8]. However, due to various technical challenges, only recently has dual-energy CT imaging become a reality. Recent advances in CT scanner technologies have generated a renewed interest in dual-energy CT [9-14], which has led to the commercialization of dual-energy CT systems available for rou...

This seminar will address the dramatic impact of multislice (multidetector) CT upon imaging the oncologic patient. This technology is responsible for a dramatic change in the speed and ability for diagnostic radiologists to detect disease. Technology has advanced rapidly in the last 20 years from single-slice CT scanners to helical (spiral) technology. Continuous acquisitions of multiple images...

Purpose The aim of this retrospective analysis was to assess the diagnostic accuracy a latest generation digital positron emission tomography/computed tomography (PET/CT) scanner in detection cervical lymph node metastasis patients undergoing staging work-up for head and neck cancer. Materials methods A total 55 consecutive with cancer at our institution who had PET/CT after installation (Sieme...

The ImPACT (imaging performance assessment of CT scanners) CT patient dosimetry calculator is still used world-wide to estimate organ and effective doses (E) for computed tomography (CT) examinations, although the tool is based on Monte Carlo calculations reflecting practice in the early 1990’s. Subsequent developments in CT scanners, definitions of E, anthropomorphic phantoms, computers and ra...

OBJECTIVE Since its introduction early in the 1990s, helical CT has become the predominant technology for obtaining CT images for medical applications. Recent improvements in the temporal resolution of helical CT (subsecond) and the addition of retrospective cardiac gating are combined in this report evaluating cardiac-gated helical CT for quantifying coronary artery calcium. We compare total c...

BACKGROUND Blunt abdominal trauma in childhood contributes significantly to both morbidity and mortality. Selective non-operative management of blunt abdominal trauma in children depends on both diagnostic and clinical factors. Computed tomography (CT) scanning is widely used to facilitate better management. Increased availability of CT may, however, result in its overuse in the management of b...

Today, QCT is one of three methods, including DXA, cited by the National Osteoporosis Foundation as safe and effective for the evaluation of BMD[3]. The QCT system comprises a CT scanner calibration device and a software application on a standalone Windows PC networked to the CT scanner. At the hip, QCT produces BMD T-Score measurements that are clinically equivalent to DXA measurements[5], but...