Bookwalter
Bill Bookwalter, Somerville, MA US
Candice Bookwalter, University Heights, OH US
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20110311158 | MOTION ARTIFACT REMOVAL - Systems, methods, and other embodiments associated with removing motion artifacts from MR images are described. One example method includes controlling an MRI apparatus to acquire a fully sampled, centric-ordered, non-interleaved, data set from an object to be imaged and controlling a Generalized Auto-Calibrating Partially Parallel Acquisition (GRAPPA) logic to produce a GRAPPA duplicate of a single partition through the data set. The method also includes computing, from the GRAPPA duplicate, a GRAPPA navigator for a phase encoding (PE) line in the single partition and computing an error between the PE line in the single partition and a corresponding PE line in the GRAPPA duplicate using the GRAPPA navigator. The method also includes selectively replacing data in the PE line in the single partition with replacement data upon determining that the error exceeds a threshold. The method may include reconstructing an MR image based, at least in part, on the single partition. | 12-22-2011 |
Candice A. Bookwalter, University Heights, OH US
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20080218169 | METHODS FOR FAT SIGNAL SUPPRESSION IN MAGNETIC RESONANCE IMAGING - The present invention is directed to methods for chemical species signal suppression in magnetic resonance imaging procedures, wherein Dixon techniques are enhanced by continuously sampling techniques. In the invention, k-space data is acquired during the entire period of read gradient associated with a gradient echo pulse acquisition scheme. The invention utilizes a total sampling time (TST) acquisition during the entire read gradient, using three echoes of a TST data set to achieve chemical species separation in both homogenous fields as well as areas of field inhomogeneity. As an example, a continuously sampled rectilinearly FLASH pulse sequence is modified such that the time between echoes was configured to be 2.2 milliseconds, with TE selected to allow 180° phase variation in the fat magnetization between each of the three TE's (TE | 09-11-2008 |
20080278162 | Cartesian continuous sampling with unequal gradients - Example methods and apparatus control ratios between a maximum gradient amplitude (MGA) of a readout lobe (G | 11-13-2008 |
20080309336 | CALIBRATING pMRI WITH CARTESIAN CONTINUOUS SAMPLING - Example systems, methods, and apparatus control a pMRI apparatus to produce a pulse sequence having an extended acquisition window, and overlapping phase-encoding gradients and read gradients. One example method controls a pMRI apparatus to produce a trajectory having Cartesian and radial segments that sample in a manner that satisfies the Nyquist criterion in at least one region of a volume to be imaged. The pMRI apparatus is controlled to apply radio frequency energy to the volume according to the pulse sequence and following the trajectory and to acquire MR signal from the volume in response to the application of the RF energy. The MR signal includes a first component associated with the Cartesian segment of the trajectory and a second component associated with the radial segment of the trajectory. The example method includes calibrating a reconstruction process using Nyquist-satisfying data from the second component. | 12-18-2008 |
20100066365 | METHODS FOR FAT SIGNAL SUPPRESSION IN MAGNETIC RESONANCE IMAGING - The present invention is directed to methods for chemical species signal suppression in magnetic resonance imaging procedures, wherein Dixon techniques are enhanced by continuously sampling techniques. In the invention, k-space data is acquired during the entire period of read gradient associated with a gradient echo pulse acquisition scheme. The invention utilizes a total sampling time (TST) acquisition during the entire read gradient, using three echoes of a TST data set to achieve chemical species separation in both homogenous fields as well as areas of field inhomogeneity. As an example, a continuously sampled rectilinearly FLASH pulse sequence is modified such that the time between echoes was configured to be 2.2 milliseconds, with TE selected to allow 180° phase variation in the fat magnetization between each of the three TE's (TE | 03-18-2010 |
20100201363 | CALIBRATING PARALLEL MRI WITH CARTESIAN CONTINUOUS SAMPLING - Example systems, methods, and apparatus control a pMRI apparatus to produce a pulse sequence having an extended acquisition window, and overlapping phase-encoding gradients and read gradients. One example method controls a pMRI apparatus to produce a trajectory having Cartesian and non-Cartesian segments that sample in a manner that satisfies the Nyquist criterion in at least one region of a volume to be imaged. The pMRI apparatus is controlled to apply radio frequency energy to the volume according to the pulse sequence and following the trajectory and to acquire MR signal from the volume in response to the application of the RF energy. The MR signal includes a first component associated with the Cartesian segment of the trajectory and a second component associated with the non-Cartesian segment of the trajectory. The example method includes calibrating a reconstruction process using Nyquist-satisfying data from the second component. | 08-12-2010 |
John Bookwalter, Brattleboro, VT US
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20100210913 | DISPOSABLE PADDING FOR A SELF-RETAINING RETRACTION DEVICE - A disposable cover for a retractor of a self-retaining retractor system has an elastic sheath that can be easily placed and removed by elastically engaging the blade and a disposable pad attached on the elastic sheath. The elastic sheath can be an open cylinder (band shaped) or closed at one end (sock shaped) and is sized to cover a majority of the different size and shaped retractor blades. The elastic sheath retains the disposable pad on the blade by elastic compressive force. A single elastic sheath must be elastic enough to accommodate multiple sized blades and retain them in a fixed position while the blade is approximately vertically disposed within patient. The elastic sheath can be made from latex, nylon or any other surgical grade elastic or elastic type product. | 08-19-2010 |
John Bookwalter, Putney, VT US
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20140171748 | THREE DIMENSIONAL TILT RACHET WITH SELF RETAINING MECHANISM - A ratchet assembly for multi-dimensional movement and placement of a retractor blade includes a retractor blade holder, a housing member, a rotating indexer and a self-retaining locking mechanism. The retractor blade holder is shaped and dimensioned to receive a stem of a retractor blade and includes a locking mechanism that enables selective lateral adjustment of the retractor blade relative to the retractor blade holder. The retractor blade holder is mated to the housing member and is vertically pivotable with respect to the housing member to enable selective vertical pivoting adjustment of the retractor blade relative to the housing member. The rotating indexer is mated to the housing member, and the housing member is rotatable with respect to the rotating indexer so that the retractor blade holder, the housing member and the retractor blade are able to selectively rotate about the longitudinal axis of the rotating indexer. The rotating indexer is shaped and dimensioned to mount onto a rim of a surgical support. The self-retaining locking mechanism simultaneously locks or unlocks the position of the housing member relative to the rotating indexer and the position of the rotating indexer and the entire ratchet assembly onto the rim of the surgical support. | 06-19-2014 |
John R. Bookwalter, Brattleboro, VT US
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20130082157 | RETRACTOR RING HOLDER - A retractor ring assembly includes a ring holder that has a first selectively engaged connection and a second selectively engaged connection. A first and second ring portion each has a proximal end and a distal end. The proximal end of the first and second ring portions are selectively connected to the respective first and second selectively engaged connections of the ring holder. The distal end of the first ring portion has a third selectively engaged connection. The distal end of the second ring portion has a fourth selectively engaged connection. The third selectively engaged connection and the fourth selectively engaged connection are connectable to form a reinforced closed ring configuration, and are disconnectable to form an open ring configuration. | 04-04-2013 |
John R. Bookwalter, Putney, VT US
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20150073420 | FEMORAL ELEVATOR - A bone elevator system includes: a bone hook; a first coupling device; an elevator arm member including a substantially straight first elongate arm and a substantially straight second elongate arm which is offset from and fixedly coupled with the first elongate arm, the first coupling device coupling the first elongate arm with the bone hook, the second elongate arm configured for being coupled, by way of a second coupling device, with an anchoring post. | 03-12-2015 |