High Field 3T Coronary MRA

Currently, the vast majority of research into coronary MRA as well as most technical innovations and clinical applications are performed on 1.5T systems. For many of these applications, limited SNR or lengthy examination times are impediments. The recent availability of high field systems (3T) equipped with dedicated cardiac hardware (real-time spectrometer, parallel receiver technology with high bandwidth, body RF send coil, vector ECG, etc.) and software (SENSE, navigators, interactive interface, SSFP) will permit a major step forward for coronary MRA. Preliminary in vivo findings obtained in two healthy adult subjects evaluated on a commercial 3T system (Philips Medical Systems, Best, NL) are displayed in Figure 4. The images were acquired using an ECG trig-

Fig. 4. Preliminary in vivo coronary MRA image acquired at 3T. The 3D image data were obtained during free breathing with a T2-Prep and 2D selective realtime navigator technique. The image of the right coronary system (a) was acquired with a 6-element cardiac phased-array surface coil while the image of the left coronary system (b) was acquired using a body coil

Fig. 4. Preliminary in vivo coronary MRA image acquired at 3T. The 3D image data were obtained during free breathing with a T2-Prep and 2D selective realtime navigator technique. The image of the right coronary system (a) was acquired with a 6-element cardiac phased-array surface coil while the image of the left coronary system (b) was acquired using a body coil

Arterial Spin Labeling

Fig. 5. Arterial spin labeling enables an exclusive and selective 3D visualization of the coronary arterial lumen [42]. The left coronary system (a, b, c) is displayed at 3 incremental viewing angles about the left-right axis of the examined healthy adult subject. Signal from the surrounding tissue (chest wall, atria, great cardiac vessels, coronary veins etc.) is entirely suppressed b gered segmented k-space gradient echo technique including T2-Prep and real-time navigator technology for free-breathing data acquisition (0.6 x 0.6 x 3mm voxel size) [5].

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Essentials of Human Physiology

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