Planning And Positioning In Mri Pdf Download
Karren Bangura
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Background: The application of patient-specific instrumentation (PSI) for reverse total shoulder replacement has been rapidly increasing, which could reduce errors in implant positioning. Although PSI theoretically holds promise, evidence of the accuracy and reliability of PSI in shoulder replacement surgery is limited.
Methods: Thirty-nine shoulders that underwent reverse total shoulder arthroplasty were included in this study and categorized into two groups: the conventional (n = 20) and PSI (n = 19) groups. Screw (length and angle) and baseplate (version, inclination, translation, and rotation) positioning were calculated based on postoperative computed tomography images using a three-dimensional measurement tool. The difference between the values of the preoperative target and postoperative measurement was calculated to evaluate the reproducibility of preoperative planning. Screw involvement in the suprascapular and spinoglenoid notches was assessed. Thus, the correlation between the position of the baseplate and the screws was assessed.
Results: The mean differences between the planned length and angle (anteroposterior and superoinferior angles) and postoperative measurement in the PSI group were significantly smaller than those in the conventional group. Similarly, the mean difference in baseplate rotation between the planned and postoperative measurements in the PSI group was significantly lower than that in the conventional group (4.5 vs 10.6; P < .001). The spinoglenoid notch was involved in 10 cases in the conventional group and 2 cases in the PSI group, and this difference was significant (P = .014). Overall, the mean difference between the preoperative and postoperative version, inferior inclination, and rotation values for the baseplate position was significantly correlated with the values for screw position (length and angle).
Conclusions: PSI improves the reproducibility of preoperative planning for baseplate and screw positioning and reduces the risk of neurovascular injury in reverse total shoulder arthroplasty.
Plan the axial slices on the sagittal plane and position the block parallel to the genu and splenium of the corpus callosum. Verify the planning block in the other two planes and ensure that an appropriate angle is maintained in the coronal plane, making it perpendicular to the line of the midline of the brain and the 4th ventricle. Ensure that the number of slices is sufficient to cover the entire brain from the vertex to the line of the foramen magnum.
RESOLVE DWI: RESOLVE is an advanced technique used to obtain high-quality and high-resolution DWI (diffusion-weighted imaging) images, particularly in body regions affected by susceptibility artifacts. It offers sharp imaging with minimal distortions and provides excellent spatial resolution. RESOLVE is especially valuable for evaluating smaller lesions in a wide range of DWI and DTI (diffusion tensor imaging) examinations. By combining RESOLVE with Simultaneous Multi-Slice (SMS) acceleration, acquisition time can be significantly reduced, improving both speed and imaging capabilities. RESOLVE finds application in various clinical fields, including neurology, oncology, and pediatric imaging. Its outstanding balance between imaging speed and quality makes it superior to other diffusion-weighted imaging sequences. Benefits of RESOLVE include high-quality DWI and DTI, reduced susceptibility and blurring artifacts, insensitivity to motion-induced phase errors, lower specific absorption rate (SAR) compared to TSE-based methods, and compatibility with iPAT for faster scans and further reduced distortions.
Plan the coronal slices on the sagittal plane and angle the planning block perpendicular to the line along the genu and splenium of the corpus callosum. Verify the planning block in the other two planes. Ensure that an appropriate angle is maintained in the axial plane, perpendicular to the midline of the brain. The number of slices should be sufficient to cover the entire brain from the frontal sinus to the line of the occipital protuberance.
Plan the sagittal slices on the axial plane and position the block parallel to the midline of the brain. Verify the planning block in the other two planes. Angle the planning block appropriately in the coronal plane, ensuring it is parallel to the line along the midline of the brain and the 4th ventricle. Make sure that the number of slices is sufficient to cover the entire brain from one temporal lobe to the other.
To minimize air-bone interface artifacts, plan the DWI axial slices on the sagittal plane with the planning block angled parallel to the line connecting the glabella and the foramen magnum. It is important to note that older generation scanners can create such artifacts. For epi DWI scans, a different angle is used compared to other axial scans, aligning it with the glabella and foramen magnum. Make sure to verify the planning block in the other two planes and determine an appropriate angle in the coronal plane that is perpendicular to the line of the 3rd ventricle and brainstem. Additionally, ensure that the slices adequately cover the entire brain from the vertex to the foramen magnum.
Description: With the common adoption of GNSS in land surveying, best practices have evolved with improving hardware and faster data processing. This lesson follows several surveyors as they work their way through projects, touching all aspects from initial planning up through field work. In the process they gather all the necessary data to begin processing that data.
In addition to investing to discover how their product/service can deliver value, organizations need to clearly define their positioning strategy, as well as the value proposition of each solution.
A positioning strategy is a strategic marketing plan that helps determine where your business stands in the market and how it should be positioned to attract more customers. It is a marketing strategy focused on distinguishing a brand from its competitors.
A poorly positioned product will never reach its full potential, no matter how well it is marketed. In contrast, an excellent positioning strategy can be all that stands between failure and profitability.
Positioning strategies help companies become an authority in their field, distinguish themselves from competitors for better brand recognition, or even create new markets by identifying unmet needs among consumers. More specifically, businesses may use this approach when going up against established players who have been around longer.
Essentially, Lyft understood they had to be different, and although they followed much of what Uber had pioneered. They took their branding and culture in the opposite direction. You see, positioning influences pricing, marketing, and sales strategy. But to be truly successful, the strategy needs to make sense to different target groups of customers.
1. Channel: Your channel is how customers interact with your brand. Use market research to collect consumer desires and behavior metrics, then leverage this information to best connect with your customer.
Your channel is also central to understanding customer needs and is where you will likely find the majority of information for successful positioning. It is a direct connection to the consumer; you can get information such as the customer profile, customer problems, competitive intelligence, and the purchase process.
Channels help identify brand strengths to effectively focus your positioning strategy on what you do well as a brand.
Research to see if there is a problem customers need a solution for and what needs they might report via surveys, interviews, and reviews. Listening to buyer needs and placing a high importance on those needs is pivotal in getting customer attention and loyalty.
Final Tip: Helps find the right staff: Clear proposition strategies and value propositions help persuade new staff to join your team. When you clearly state what is expected from potential new team members and what your company stands for, you ensure new colleagues already understand your fundamental values.
DOD has made some progress on initial testing of the receiver cards needed to utilize the M-code signal. However, additional development is necessary to make M-code work with over 700 weapon systems that require it. DOD has begun initial planning for some weapon systems, but more remains to be done to understand the cost and schedule needed to transition to M-code receivers. The preliminary estimate for integrating and testing a fraction of the weapon systems that need the receiver cards is over $2.5 billion through fiscal year 2021 with only 28 fully and 72 partially funded (see figure). The cost will increase by billions when as yet unfunded weapon systems are included.
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