Reliability of a new method for coronary artery calcium or metal subtraction by 320-row cardiac CT

Abstract

• Calcium and metal artefacts are still a limitation for conventional coronary CTA • Diagnostic accuracy is improved by subtraction as compared with conventional CTA • Subtraction CTA is a promising tool to overcome limitations of conventional CTA.

Diagnostic accuracy of a modified subtraction coronary CT angiography method with short breath-holding time: a feasibility study

“…4,5 Recently, it has also been reported that subtraction CCTA was useful in patients with coronary stents. 7,8 However, subtraction CCTA requires a long breath-holding time. In subtraction CCTA, to minimize misregistration artefact due to differences in the breath-hold position, the two scans for obtaining the mask image (mask scan) and post-contrast image (post-contrast scan) should ideally be performed in a single breath-holding.…”

“…1,2 Promising results have been reported applying subtraction CCTA using 320-detector row CT scanner in patients with severe calcifications or stents. [3][4][5][6][7][8] With subtraction CCTA, coronary calcifications and stents are removed by subtracting mask image data (pre-contrast image data) from post-contrast image data. To minimize misregistration artefact due to differences in the breath-hold position, the required scans (mask and post-contrast scans) should be performed in a single breath-hold.…”

“…3 Although this method may minimize misregistration artefacts, a long breath-holding time of approximately 20-40 s is required. [3][4][5][6][7][8] This long breath-holding time represents a major limitation for subtraction CCTA because it may exclude patients who cannot hold their breath for over 20 s.…”

A New Contrast Enhancement Protocol for Subtraction Coronary Computed Tomography Requiring a Short Breath-Holding Time

“…This effective method allows calcium to be subtracted from coronary computed tomography angiography (CCTA) images, providing improved diagnostic accuracy over conventional CCTA in patients with severe coronary artery calcification and stent (1)(2)(3)(4)(5)(6)(7). SCCTA uses two CCTA datasets collected pre-contrast and after contrast enhancement.…”

The Possibility of Using Subtraction MSCT-Coronary Angiography in the Diagnosis of Changes in the Coronary Arteries With Massive Calcification and the Presence of Stents

“…H, и, выждав паузу в 5 секунд, начиталось томографирование контрастной фазы исследования. В результате чего, время задержки дыхания пациентов составляло около 30-35 секунд [16,25,26,27,29,30,31,34].…”