Abstract: Systems and methods for quality assurance (QA) in single-isocenter, multi-target (SIMT) radiation therapy. The QA may include measuring an actual position of an off-isocenter radiation opaque marker of a phantom, using the actual marker position to compute a beam's eye view marker position that is a projected position of the off-isocenter marker in an expected field contour of an expected radiation beam, and acquiring a 2D radiation transmission image indicative of a radiation field of a generated radiation beam after passing through the off-isocenter marker. The QA may include aligning the beam's eye view marker position with a centroid of a measured marker contour in the 2D radiation transmission image at a common marker reference point and determining a geometric error that is a 2D distance between a centroid of the expected field contour and a centroid of a measured field contour in the 2D radiation transmission image.

Abstract: The present invention provides an in-reactor solution that avoids costly blending and the use of metallocene elastomers. The inventive Ziegler-Natta polypropylene composition also includes additional components that may improve properties relative to a metallocene catalyzed elastomers. The invention is a clear impact polypropylene composition that is made in-reactor with Ziegler-Natta catalyst, and is suitable for a wide range of processes. Unlike other clear impact copolymers, it does not rely on high-shear processes or compounding with elastomers. The invention uses conventional polypropylene reactor technology to produce these compositions.

Abstract: The present invention provides an in-reactor solution that avoids costly blending and the use of metallocene elastomers. The inventive Ziegler-Natta polypropylene composition also includes additional components that may improve properties relative to a metallocene catalyzed elastomers. The invention is a clear impact polypropylene composition that is made in-reactor with Ziegler-Natta catalyst, and is suitable for a wide range of processes. Unlike other clear impact copolymers, it does not rely on high-shear processes or compounding with elastomers. The invention uses conventional polypropylene reactor technology to produce these compositions.

Abstract: A method of making a solid procatalyst composition for use in a Ziegler-Natta olefin polymerization catalyst composition, said method comprising: contacting a solid precursor composition comprising magnesium, titanium, and alkoxide moieties with a titanium halide compound and an internal electron donor in any order, in a suitable reaction medium to prepare a solid procatalyst composition, separating the solid procatalyst from the reaction medium, further exchanging residual alkoxide functionality of the solid procatalyst composition for chloride functionality by contacting the same two or more times with benzoyl chloride halogenating agent under metathesis conditions for a period of time sufficient to prepare a solid procatalyst composition having a decreased alkoxide content compared to the alkoxide content of the solid procatalyst composition before said exchange, and recovering the solid procatalyst composition.