Dynamic four-dimensional computed tomography (4D CT) imaging for re-entry risk assessment in re-do sternotomy - first experience.

Background: Repeat cardiac surgeries are well known to have higher rates of complications, one of the important reasons being injuries associated with re-do sternotomy. Routine imaging with CT can help to minimise this risk by pre-operatively assessing the anatomical relation between the sternum and the underlying cardiovascular structures, but is limited by its inability to determine the presence and severity of functional tethering and adhesions between these structures. However, with the evolution of wide area detector MD CT scanners, it is possible to assess the presence of tethering using the dynamic four-dimensional CT (4D CT) imaging technique.

Normal perfusion of the left ventricular myocardium using 320 MDCT.

Background: CT myocardial perfusion imaging is an emerging CT application using density measurements of contrast-enhanced left ventricular (LV) myocardium.

Objective: Using a 320-MDCT we have consistently observed lower Hounsfield unit (HU) values in the lateral LV myocardium, potentially mimicking perfusion defects. This study aimed to evaluate contrast-enhancement patterns of the LV myocardium in normal studies.

Diagnostic accuracy of noninvasive coronary angiography with 320-detector row computed tomography.

We sought to evaluate the diagnostic accuracy of noninvasive coronary angiography using 320-detector row computed tomography, which provides 16-cm craniocaudal coverage in 350 ms and can image the entire coronary tree in a single heartbeat, representing a significant advance from previous-generation scanners. We evaluated 63 consecutive patients who underwent 320-detector row computed tomography and invasive coronary angiography for the investigation of suspected coronary artery disease. Patients with known coronary artery disease were excluded.

Comparison of 4 cm Z-axis and 16 cm Z-axis multidetector CT perfusion.

Objective: The aim of the study was to compare 4 cm with 16 cm Z-axis coverage in the assessment of brain CT perfusion (CTP) using. 320 slice multidetector CT METHODS: A retrospective non-randomised review of CTP performed on MD320 CT between September 2008 and January 2009 was undertaken. Two experienced readers reviewed the studies along with the 4 cm and 16 cm Z-axis CTP image data set.