Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
Skip to main content

    Iain Butler

    University College London and The Imperial College of Science, Technology & Medicine are together developing a new large area imaging photon counting system, BIGMIC, for use primarily on very large telescopes. This detector is designed... more
    University College London and The Imperial College of Science, Technology & Medicine are together developing a new large area imaging photon counting system, BIGMIC, for use primarily on very large telescopes. This detector is designed for applications requiring the highest sensitivity and resolution such as, high dispersion Echelle spectroscopy. The system incorporates a specially designed 75mm active diameter image intensifier
    ... Takashi Masuda1, Hideyuki Suzuki1, Hiroshi Iizuka1, Akiko Igarashi1, Kaneyoshi Takeshita1, Takayuki Mogi1, Norio Shoji1, Jeremy Chatwin2, Iain Butler2, Derek Mellor2 ... Tech. Papers, pp. 172-173, Feb., 2004. [7] Carl R. Battjes,... more
    ... Takashi Masuda1, Hideyuki Suzuki1, Hiroshi Iizuka1, Akiko Igarashi1, Kaneyoshi Takeshita1, Takayuki Mogi1, Norio Shoji1, Jeremy Chatwin2, Iain Butler2, Derek Mellor2 ... Tech. Papers, pp. 172-173, Feb., 2004. [7] Carl R. Battjes, “Amplifier Circuit,” US Patent 3,633,120. ...
    Congenital hearing loss affects 3 - 6/1 000 children worldwide. The benefits of early identification of hearing loss and early intervention have been clearly established. There are no previous studies reporting on the age of diagnosis of... more
    Congenital hearing loss affects 3 - 6/1 000 children worldwide. The benefits of early identification of hearing loss and early intervention have been clearly established. There are no previous studies reporting on the age of diagnosis of congenital hearing loss in the Free State province. To determine the age of diagnosis of congenital hearing loss in the Otorhinolaryngology Clinic at Universitas Hospital. Secondary aims included determining age at first visit, as well as the time delay between first visit and diagnosis, and documenting any interventions which took place. A retrospective, descriptive study was undertaken, analysing data from 2001 to 2010. A total of 260 cases of congenital hearing loss were analysed. The median age of diagnosis of hearing loss was 44.5 months. The median age of first visit was 40.9 months, and the median delay between first visit and diagnosis was 49 days. The median age of diagnosis far exceeds national and international benchmarks. This has a profoundly negative impact on the development and outcomes of children with hearing loss. These results have been used to motivate for the expansion of hearing screening and diagnostic services in the province.
    Chronic suppurative otitis media (CSOM) is common among children in southern Africa. Managing associated co-morbidities may result in earlier disease resolution. Children <13 years of age... more
    Chronic suppurative otitis media (CSOM) is common among children in southern Africa. Managing associated co-morbidities may result in earlier disease resolution. Children <13 years of age with otorrhoea lasting >4 weeks were recruited to the study. Each child underwent a full clinical examination, a blood count, an HIV test and CD4 cell count, if found to be infected. The study included 86 children, and the median age was 4.6 years. HIV infection was present in 45 of 83 children (54.2%), of which 23 (51.1%) were receiving antiretroviral treatment at the time of presentation. Underweight was present in 22 of 85 (25.9%) children and in 17 of the 45 (37.8%) HIV-infected children. One or more clinical signs (not aural-related) were found in 46 of 86 (53.4%) children. Cholesteatoma was found in 23 of 113 (20.4%) ears, and 9 of 86 (10.5%) children had serious associated aural or intracranial complications. A high percentage of children with CSOM have associated pathology that needs to be diagnosed to optimally manage CSOM.
    Performance of a large-area microchannel plate photon counting intensifier. [Proceedings of SPIE 2278, 126 (1994)]. Iain G. Butler, Timothy J. Norton, Robert J. Airey, Brian L. Morgan, John LA Fordham, David A. Bone, RM Michel-Murillo.... more
    Performance of a large-area microchannel plate photon counting intensifier. [Proceedings of SPIE 2278, 126 (1994)]. Iain G. Butler, Timothy J. Norton, Robert J. Airey, Brian L. Morgan, John LA Fordham, David A. Bone, RM Michel-Murillo. Abstract. ...
    To identify and describe predictors of pediatric cochlear implantation outcomes in a South African population. A retrospective study of 301 pediatric cochlear implant (CI) recipients from five CI programs was conducted and cross-sectional... more
    To identify and describe predictors of pediatric cochlear implantation outcomes in a South African population. A retrospective study of 301 pediatric cochlear implant (CI) recipients from five CI programs was conducted and cross-sectional outcome data were added at the time of data collection. Twenty potential prognostic factors were identified from the retrospective dataset, including demographical, CI, risk and family factors. Multiple regression analyses were performed to identify predictor variables that influence outcomes in terms of auditory performance (CAP scores), speech production (SIR scores), communication mode and educational placement. Although implanted children within this sample did not have equal opportunity to access a second implant, bilateral implantation was strongly predictive of better auditory performance and speech production scores, an oral mode of communication and mainstream education. NICU admittance/prematurity were associated with poorer auditory performance and speech production scores, together with a higher probability for non-oral communication and non-mainstream education. The presence of one or more additional developmental condition was predictive of poorer outcomes in terms of speech production and educational placement, while a delay between diagnosis and implantation of more than one year was also related to non-mainstream education. Ethnicities other than Caucasian were predictive of poorer auditory performance scores and a lower probability for mainstream education. An extensive range of prognostic indicators were identified for pediatric CI outcomes in South Africa. These predictive factors of better and poorer outcomes should guide pediatric CI services to promote optimal outcomes and assist professionals in providing evidence-based informational counseling.