![www dooble ir www dooble ir](https://cdn.shopify.com/s/files/1/0994/3066/products/dobble-galda-spele_850x.png)
Figure 2A and 2B show the non-ASSET images at 42 ms TE1 and 102 ms TE2. Similarly, Figure 2 shows the comparison of the Triple IR dual-contrast images between with and without the application of ASSET. On both the non-ASSET and ASSET images, the blood is completely darkened and no flow artifacts are observed on the myocardial boundaries. Figures 1C and 1D show the ASSET counterparts. Figure 1A and 1B show the non-ASSET images at 42 ms TE1 and 102 ms TE2. RESULTS Figure 1 shows the comparison of the Double IR dual-contrast images between with and without the application of ASSET. Heart images of a normal volunteer were acquired in the direction of the short axis within a single breath-hold period with and then without the application of ASSET. A four channel torso phase array coil was used. The acquisition was acquired at the"Whole Body" gradient mode with the slew rate of 80 mT/m/ms. The following imaging parameters were applied: 42 ms TE1, 102 ms TE2, 575 ms TI, 62.5 kHz BW, ECG triggered with 2 R-R intervals, 40 cm FOV, 256×256 matrix size, 4 mm slice thickness, 1 NEX, 1 phase FOV, 4.2 ms echo spacing, and 0.5 ASSET acceleration factor. The second group with 16 ETL formed the image at the second TE (TE2). The first group of echoes with 16 ETL formed the image at the first TE (TE1). A total of 32 ETL (Echo Train Length) was used for the sequence. The dual contrast was achieved through a split echo train. The Triple IR preparation was consisted of the Double IR pulse and an extra RF pulse to suppress the fat signal. The Double IR preparation was consisted of a non-selective adiabatic inversion pulse followed immediately by a selective inversion pulse. METHOD Double/Triple IR preparation was implemented in the dual-contrast FSE sequence on a 1.5T GE Signa Twinspeed Whole-body MR scanner (GE Medical Systems, Milwaukee, WI) with EXCITE (Expanding Applications with MultiCoil Technology) technology. In this study, the ASSET (or SENSE) technique has been applied to reduce the required breath-hold time to complete the dual-contrast FSE image acquisition. However, the acquisition requires a long breath-hold period and thus limits its clinical application. This technique provides images with two different contrasts obtained at the same cardiac cycle through a single acquisition. This problem is reduced through the recently introduced black-blood dual-contrast FSE technique (5,6). However, these images have been acquired in separate scans, and thus image location is often registered incorrectly. In these studies, tissue contrast differentiation has been achieved through images acquired at different TE's (e.g., proton density and T2-weighted images). Its applications include myocardial tissue characterization (2), vessel wall imaging (3) and plaque characterization (4).
![www dooble ir www dooble ir](http://www.rozup.ir/view/104290/police%20bazi.jpg)
This method provides blood signal nulling to reduce flow artifacts in tissue boundaries. The combination of filters and signal processing allows the sensor to be used without risk of false alarms in difficult situations characterised by factors such as flickering sunlight.INTRODUCTION Black-blood imaging using double or triple inversion recovery (Double/Triple IR) pulses for cardiovascular applications has increased in recent years (1,2,3,4).
![www dooble ir www dooble ir](https://static.cdn.asset.aparat.com/avt/938773-6556-b__867770393.jpg)
![www dooble ir www dooble ir](https://img.dalfak.com/video-7/84/84889-55121561981.jpg)
The combination of UV and IR² detection, plus signal processing allows the UV / IR² sensor to be used without risk of false alarms in difficult situations characterised factors such as flickering blackbody radiation or arc welding. Gas fires not visible to the naked eye e.g. By responding to 1.0 to 2.7µm light emitted by every fire, all flickering flames can be detected. Most IR flame sensors respond to 4.3µm light, emitted by hydrocarbon flames. The IR² unit has excellent tolerance to detector window contamination and can detect flame through glass windows.Ī flame sensor test unit is available for accurate testing of the detectors. The units are tolerant to vibration, and wind does not affect the performance. Remote test inputs are available to activate self-test.Ī stainless steel adjustable bracket and weather shield is also available. The units can be wired as conventional 2 wire, 4-20 mA, or relay contacts (fire, fault and pre alarm) in latching or non-latching operation. A high and low sensitivity setting according to EN54-10 is provided. New micro-processor technology makes the detectors independent of flame intensity enabling it to operate through smoke, a layer of oil, dust, or water vapor. UV / IR² models have execellent response to flame while providing immunity to extraneous sources. The Talentum 16591 is a UV / IR² flame detector in a die-cast zinc alloy housing. Description du produit Talentum-16591 - Détecteur de Flamme Combiné UV/IR2 en boitier métal - FFE