Manifold_Speech_MR_dataset

Experiments were performed on a 3T GE Premier scanner using a custom 16 channel airway coil a healthy subject. The subject were scanned in accordance to our institute's review board protocol, and informed consent were obtained from the subject prior to the study. Subject was scanned while producing repeated phrase "loo-lee-la-za-na-za" at the subject's natural pace.<br> A gradient echo based variable density spiral sampling with golden angle view ordering was used to acquire three 2D slices in the mid sagittal plane. Golden angle increments occurred only after spiral arms at a specified angle were acquired from all the slices. The design sequence parameters were: slew rate = 140 mT/m/ms, maximum gradient amplitude = 80 mT/m, sampling time = 4 ms, spatial resolution = 2.4 mm x 2.4 mm, field of view (FOV in <em>cm</em>2) = 20 × 20, flip angle = 5 <em>degrees</em>, TR = 52.2 <em>ms</em>, slice thickness = 6 <em>mm</em>, number of slices = 3, spiral interleaves required for Nyquist sampling = 27, readout points = 335, readout duration = 1.3 <em>ms.</em> The "SpeechVDS27_repeated_looleelaZaNaZa_sub2_3_slices<strong>.mat</strong>" file contails the followings: <br> <strong>w</strong>: density compensation factor (readout points × spiral arms) <br> <strong>kloc</strong>: kspace trajectory (readout points × spiral arms) <br> <strong>kdata</strong>: MRI data (readout points × spiral arms ×coils × slices)