FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2981583642> ?p ?o ?g. }

• W2981583642 abstract "Purpose: Pelvic radiography using X-ray imaging has traditionally been used for the identification of hip joint changes, including the identification of pathologies such as osteoarthritis. For patients suffering from hip pain, the supine pelvis X-ray examination is one of the initial diagnostic steps. Despite this, many recent studies have recommended that the position should now be undertaken erect and not supine to reflect the functional appearances of the hip joint. This thesis aims to establish an evidence base for erect pelvis radiography, and it will include assessing radiographic positioning, radiation dose and image quality. Methods: The experimental work described in this thesis was conducted in three phases. Each phase has its own methods with the purpose of achieving a specific set of aims. Phase One was the evaluation of the postural effects of different erect (standing) positions in order to recommend an optimal one for erect pelvic radiography. Eight different erect positions were investigated. A sample group of 67 healthy people participated, and a range of spinal and pelvis measurements were acquired using a 3D video rasterography system (Diers) and an inclinometer.Phase Two was a phantom study evaluating the potential changes to radiation dose and image quality when moving between supine and erect imaging. Phase two was undertaken using three experiments (experiment #1, experiment #2 and experiment #3). Experiment #1 evaluated the impact of increased patient size on the radiation dose and image quality. In this experiment, animal fat was positioned anteriorly on a pelvic anthropomorphic phantom and the thickness increased incrementally in 1cm steps from 1 to 15cm. Image quality was evaluated physically and visually. The effective dose was calculated using Monte Carlo simulation software (PCXMC). During experiment #2, the anterior thicknesses for 109 patients, with a range of BMIs, who were referred for pelvis radiography, was measured in the erect and supine position. Experiment #3 evaluated the potential differences between the positions (supine and erect) in terms of image quality and radiation dose by modelling patient thickness changes between positions using the data obtained in experiment #2. An anthropomorphic phantom was used and modified (by adding additional fat) to simulate tissue changes for both erect and supine X-ray positions. Visual grading analysis was used (VGA) to evaluate image quality. The effective dose and absorbed dose were calculated using PCXMC.During Phase Three, 60 patients were imaged in erect and supine positions. The paired pelvis X-ray images were then compared, taking into account radiation dose and image quality.Results: Phase One demonstrated no statistical differences between the eight-different standing positions for pelvic and spine metrics (P>0.05). Results also demonstrated no significant postural differences between BMIs across all eight standing positions (P>0.05). Also, no differences (P>0.05) were identified in the pelvis and spinal metrics when comparing between males and females .Standing relaxed with feet internally rotated by 20°and the upper arms supported was a recommendation derived from this phase. Results from Phase Two showed an increase in effective dose (E) as the fat thickness increased. Also, all physical and visual image quality metrics decreased as fat thickness increased. Physical and visual image quality measures also decreased for erect images when compared to supine images, and the E also increased. 90kVp, 130/145 SID, using both outer chambers, were the recommended exposure parameters settings for obtaining erect pelvis X-ray images. Results from Phase Three showed that anterior patient thickness was 17% (P<0.001) higher in an erect position .The DAP and absorbed dose were 46% and 45% (P<0.001) greater in the erect position. Also, the effective dose was 67% (P<0.001) higher in the erect position when compared with supine. In regard to the image quality (IQ), that of the erect position decreased by 10% when compared with supine (P<0.001).Conclusion: The eight proposed standing positions could theoretically be suitable for erect pelvis imaging. People in a relaxed standing position, with their feet internally rotated by 20°and their upper arms supported would be recommended. In terms of IQ and radiation dose for erect positions, this position decreases image quality (both physical and visual) and increased radiation dose. Changes were largely due to the effect of gravity on the anterior soft tissue distribution. These issues should be considered and optimised more fully when deciding if to move from supine to erect pelvis imaging." @default.
• W2981583642 created "2019-11-01" @default.
• W2981583642 creator A5091064784 @default.
• W2981583642 date "2019-01-01" @default.
• W2981583642 modified "2023-09-26" @default.
• W2981583642 title "Establishing an evidence-base for erect pelvis radiography : positioning, radiation dose and image quality" @default.
• W2981583642 cites W114243215 @default.
• W2981583642 cites W1262209044 @default.
• W2981583642 cites W1515135833 @default.
• W2981583642 cites W1541240576 @default.
• W2981583642 cites W1546036462 @default.
• W2981583642 cites W1554153362 @default.
• W2981583642 cites W1555940175 @default.
• W2981583642 cites W1560098085 @default.
• W2981583642 cites W158263995 @default.
• W2981583642 cites W174985497 @default.
• W2981583642 cites W1760548340 @default.
• W2981583642 cites W1810125499 @default.
• W2981583642 cites W1838316701 @default.
• W2981583642 cites W1920182862 @default.
• W2981583642 cites W1951487521 @default.
• W2981583642 cites W1959635012 @default.
• W2981583642 cites W1964155544 @default.
• W2981583642 cites W1970555338 @default.
• W2981583642 cites W1971324889 @default.
• W2981583642 cites W1971925634 @default.
• W2981583642 cites W1972138323 @default.
• W2981583642 cites W1974715421 @default.
• W2981583642 cites W1975081351 @default.
• W2981583642 cites W1977347518 @default.
• W2981583642 cites W1981478945 @default.
• W2981583642 cites W1982353151 @default.
• W2981583642 cites W1982765432 @default.
• W2981583642 cites W1983333297 @default.
• W2981583642 cites W1984478335 @default.
• W2981583642 cites W1985059600 @default.
• W2981583642 cites W1986493454 @default.
• W2981583642 cites W1988782889 @default.
• W2981583642 cites W1988788573 @default.
• W2981583642 cites W1990654820 @default.
• W2981583642 cites W1991927674 @default.
• W2981583642 cites W1993845722 @default.
• W2981583642 cites W1995288925 @default.
• W2981583642 cites W1995570533 @default.
• W2981583642 cites W1995731619 @default.
• W2981583642 cites W1998335524 @default.
• W2981583642 cites W1998893084 @default.
• W2981583642 cites W1999131854 @default.
• W2981583642 cites W1999509685 @default.
• W2981583642 cites W2001391036 @default.
• W2981583642 cites W2003107253 @default.
• W2981583642 cites W2004256643 @default.
• W2981583642 cites W2007900078 @default.
• W2981583642 cites W2009113418 @default.
• W2981583642 cites W2010721241 @default.
• W2981583642 cites W2016221425 @default.
• W2981583642 cites W2018909696 @default.
• W2981583642 cites W2019184303 @default.
• W2981583642 cites W2019677303 @default.
• W2981583642 cites W2024415877 @default.
• W2981583642 cites W2026018404 @default.
• W2981583642 cites W2026147097 @default.
• W2981583642 cites W2026526234 @default.
• W2981583642 cites W2027970609 @default.
• W2981583642 cites W2028866012 @default.
• W2981583642 cites W2029273345 @default.
• W2981583642 cites W2029283972 @default.
• W2981583642 cites W2030514329 @default.
• W2981583642 cites W2031552115 @default.
• W2981583642 cites W2031829170 @default.
• W2981583642 cites W2032503621 @default.
• W2981583642 cites W2035950812 @default.
• W2981583642 cites W2036526660 @default.
• W2981583642 cites W2037149629 @default.
• W2981583642 cites W2038484287 @default.
• W2981583642 cites W2039674571 @default.
• W2981583642 cites W2041083818 @default.
• W2981583642 cites W2041151122 @default.
• W2981583642 cites W2041656466 @default.
• W2981583642 cites W2044422376 @default.
• W2981583642 cites W2047768045 @default.
• W2981583642 cites W2047926760 @default.
• W2981583642 cites W2049536885 @default.
• W2981583642 cites W2049974605 @default.
• W2981583642 cites W2051138988 @default.
• W2981583642 cites W2053005822 @default.
• W2981583642 cites W2055434715 @default.
• W2981583642 cites W2059231449 @default.
• W2981583642 cites W2060337753 @default.
• W2981583642 cites W2063944090 @default.
• W2981583642 cites W2071619032 @default.
• W2981583642 cites W2072500831 @default.
• W2981583642 cites W2072619434 @default.
• W2981583642 cites W2073471525 @default.
• W2981583642 cites W2073649142 @default.
• W2981583642 cites W2074954083 @default.
• W2981583642 cites W2075342143 @default.
• W2981583642 cites W2076366797 @default.
• W2981583642 cites W2076971097 @default.
• W2981583642 cites W2079284016 @default.

• next