Visual function assessment of diagnostic radiography students

Introduction: Deterioration of visual acuity (VA) and visual impairment has been linked to age-related subtle changes, gender, and a correlation to socioeconomic status. This study aimed to assess first-year diagnostic radiography students’ visual functional abilities by applying the International Classification of Impairments, Disabilities and Handicaps (ICIDH) recommendations of functional VA screening and health-related quality of life questionnaire (HRQOL). Methods: The design followed the World Health Organisation (WHO) electronic VA testing of monocular sight using LogMAR charts and binocular vision using Snellen charts, and an HRQOL questionnaire assessing for reduced ability of visual-based tasks in activities of daily living (ADL). The data was evaluated in correlation to the participant’s visual correction, age, gender, and socioeconomic background. Results: Seventy students were recruited, all meeting the WHO standard level for visual ability, with 100% (n=70/70) met or achieved above normal binocular vision, correlating to expected normal population results from published studies for age. The monocular vision demonstrated 74% (n=52/70) for the right eye, and 80% (n=56/70) for the left eye for normal vision levels. The results did not differ significantly between each eye (p=0.21), gender variations between the left eye (p=0.27) and the right eye (p=0.10) results were affected by sample ratio of females (80%; n=56/70) to males (20%; n=14/70), the visual correction did not impair binocular VA. The HRQOL assessment indicated no significant functional VA issues in the study sample. The study demonstrated no association between the participant’s socioeconomic background that may influence their VA ability. Conclusion: The results provided normative binocular and monocular data on visual function in a sample of student radiographers and indicated that their thresholds align to normal (or near-normal) VA standards. Implications for practice: The visual health data was reviewed for subgroup comparison and trend analysis, and did not identify risk factors within this sample group that their VA and visual functioning would impact upon radiography clinical placement tasks and activities. The sample is not generalisable to the wider population; further studies are recommended

Pre-registration UK diagnostic radiography student ability and confidence in interpretation of chest X-rays

Introduction Chest X-rays are the most frequently requested X-ray imaging in English hospitals. This study aimed to assess final year UK radiography students' confidence and ability in image interpretation of chest X-rays. Methods Thirty-three diagnostic radiography students were invited to assess their confidence and ability in interpreting chest x-rays from a bank of n=10 cases using multiple choice answers. Data analysis included 2x2 contingency tables, Kappa for inter-rater reliability, a Likert scale of confidence for each case, and questions to assess individual interpretation skills and ways to increase the learning of the subject. Results Twenty-three students participated in the study. The pooled accuracy achieved was 61% (95% CI 38.4-77.7; k=0.22). The degree of confidence and ability varied depending upon the student and the conditions observed. High confidence was noted with COVID-19 (n=12/23; 52%), lung metastasis (n=14/23; 61%), and pneumothorax (n=13/23; 57%). Low confidence was noted with conditions of consolidation (n=8/23; 35%), haemothorax (n=8/23; 35%), and surgical emphysema (n=8/23; 35%). From the sample n=11 (48%), participants stated they felt they had the knowledge to interpret chest X-rays required for a newly qualified radiographer. Conclusion The results demonstrated final year radiography students' confidence and ability in image interpretation of chest X-rays. Student feedback indicated a preference for learning support through university lectures, online study resources, and time spent with reporting radiographers on clinical practice to improve ability and confidence in interpreting chest X-rays

Comparing the standard knee X-ray exposure factor, 10 kV rule, and modified 10 kV rule techniques in digital radiography to reduce patient radiation dose without loss of image quality

Introduction The 10 Kilovoltage (kV) rule was a historic exposure adaption technique designed for film screen X-ray imaging to reduce ionising radiation dose without loss of image quality. This study evaluates knee X-ray radiation dose and image quality between standard patient exposure factors, the historic 10 kV rule (−50 % Milliampere-second (mAs), and a modified 10 kV rule (−75 % mAs) using a digital radiography (DR) system. Method Applying the exposure factors of 63 kV and 8 mAs (standard pre-set exposure), 73 kV and 4 mAs (historic 10 kV rule) and 73 kV and 2 mAs (modified 10 kV) to a phantom knee and recording entrance skin dose (ESD) using thermoluminescence dosemeters (TLDs). The ESD was analysed with a t-test. The image quality was assessed using a Likert 5-point Visual Grading Analysis (VGA) by (n = 3) independent observers. The ESD data was analysed with Analysis of Variance (ANOVA) for differences between the techniques. Results The ESD reduction for the historic 10 kV rule was 32.1–33.7 % (20.9 μGy; p = 0.00), and the modified 10 kV rule 81.5–81.8 % (42.1–43.7 μGy; p = 0.00) compared to the standard pre-set exposure technique. The historic and modified 10 kV exposure parameters image quality for the AP views knee X-rays scored higher (p = 0.00) than the standard preset exposure images. The VGA for the lateral knee view using the historic (−0.1 VGA; p = 0.02) and the modified 10 kV (−0.3 VGA; p = 0.00) were slightly lower than the standard preset image quality, related to the trabeculae pattern and cortical outlines. Conclusion The findings suggest dose reductions could be made by modifying the exposure factors without reducing the quality of diagnostic images in the AP Knee position. The findings for the lateral knee X-rays indicate the image quality scored lower but was still within diagnostic range. Further research is required in laboratory conditions of exposure adaptations over a larger sample of anatomy thickness and applying a wider exposure (kV) range. Implications for practice One of a radiographer's many roles are to optimise techniques to improve image quality of anatomy and reduce the radiation dose to the patient. The findings have shown there is potential for further research using the modified 10 kV rule

Excess open solar magnetic flux from satellite data: 2. A survey of kinematic effects

We investigate the “flux excess” effect, whereby open solar flux estimates from spacecraft increase with increasing heliocentric distance. We analyze the kinematic effect on these open solar flux estimates of large-scale longitudinal structure in the solar wind flow, with particular emphasis on correcting estimates made using data from near-Earth satellites. We show that scatter, but no net bias, is introduced by the kinematic “bunching effect” on sampling and that this is true for both compression and rarefaction regions. The observed flux excesses, as a function of heliocentric distance, are shown to be consistent with open solar flux estimates from solar magnetograms made using the potential field source surface method and are well explained by the kinematic effect of solar wind speed variations on the frozen-in heliospheric field. Applying this kinematic correction to the Omni-2 interplanetary data set shows that the open solar flux at solar minimum fell from an annual mean of 3.82 × 1016 Wb in 1987 to close to half that value (1.98 × 1016 Wb) in 2007, making the fall in the minimum value over the last two solar cycles considerably faster than the rise inferred from geomagnetic activity observations over four solar cycles in the first half of the 20th century

Excess open solar magnetic flux from satellite data: 1. Analysis of the third perihelion Ulysses pass

We use the third perihelion pass by the Ulysses spacecraft to illustrate and investigate the “flux excess” effect, whereby open solar flux estimates from spacecraft increase with increasing heliocentric distance. We analyze the potential effects of small-scale structure in the heliospheric field (giving fluctuations in the radial component on timescales smaller than 1 h) and kinematic time-of-flight effects of longitudinal structure in the solar wind flow. We show that the flux excess is explained by neither very small-scale structure (timescales 1 day) solar wind speed variations on the frozen-in heliospheric field. We show that averaging over an interval T (that is long enough to eliminate structure originating in the heliosphere yet small enough to avoid cancelling opposite polarity radial field that originates from genuine sector structure in the coronal source field) is only an approximately valid way of allowing for these effects and does not adequately explain or account for differences between the streamer belt and the polar coronal holes

Diagnostic radiography students' perceptions towards communication with service users who are deaf or hearing impaired.

Communication issues can arise when deaf or hearing impaired individuals access National Health Service (NHS) radiology services if reasonable adjustments and inclusive services are not facilitated. This study aims to assess student diagnostic radiographers' attitudes and communication experience with service users who are deaf or hearing impaired. An anonymous online survey was conducted on UK undergraduate diagnostic radiography students from a single university. The sample size of students invited to participate in the study was n = 156. The measurement scales and questions included quantitative attitudinal 5-point Likert and qualitative free-response questions. Statistical analysis included the Kruskal-Wallis H test, Mann-Whitney U test, pairwise comparisons of variables and thematic coding of qualitative data. n=48 students responded. The student's perceptions of communication experiences with deaf or hearing-impaired patients were positive (72.9%) but depended on the amount of experience whilst on clinical placement (first-year students had less clinical placement experience than years two and three). Overall confidence in communicating was 47.9% with no difference by gender (p = 0.87) but variance by age category (p = 0.03), with the 18-29 group less confident and first-year students having less experience to draw upon for responses (p = 0.04). Confidence in gaining consent (56.3%) demonstrated no variation by gender (p = 0.75) or cohort (p = 0.54), but variance by age category (p = 0.03) due to difference in unmatched sample sizes. Participants elaborated on positive service adaptations that can be facilitated for service users who are deaf or hearing impaired and issues that caused negative communication experiences. The study has produced data on the experience of student radiographers interacting with an understudied service user group who are deaf or hearing impaired. Qualitative responses discussed a range of resources to assist clinical practice communication and recommendations for further improvements and training opportunities. The findings of this study can help to inform future research, policy, practice, and educational training. [Abstract copyright: Copyright © 2022 The Author(s). Published by Elsevier Ltd.. All rights reserved.

Computed tomography head and facial bones review of a 2,700 year old Egyptian mummy

Computed tomography (CT) scanning techniques used in head and facial bones examination in the clinical environment can also be transferable to the imaging of post-mortem cases as a novel non-destructive and non-invasive investigation in forensic cases. We describe a study of the head and facial bones of a 2,700 year old Egyptian mummy. Cross-sectional investigation can lead to discovering unknown information of skeletal and soft tissue structures and anatomy to contribute to the knowledge of preserved mummified remains and the practice of palaeoradiology

Centennial changes in the solar wind speed and in the open solar flux

We use combinations of geomagnetic indices, based on both variation range and hourly means, to derive the solar wind flow speed, the interplanetary magnetic field strength at 1 AU and the total open solar flux between 1895 and the present. We analyze the effects of the regression procedure and geomagnetic indices used by adopting four analysis methods. These give a mean interplanetary magnetic field strength increase of 45.1 ± 4.5% between 1903 and 1956, associated with a 14.4 ± 0.7% rise in the solar wind speed. We use averaging timescales of 1 and 2 days to allow for the difference between the magnetic fluxes threading the coronal source surface and the heliocentric sphere at 1 AU. The largest uncertainties originate from the choice of regression procedure: the average of all eight estimates of the rise in open solar flux is 73.0 ± 5.0%, but the best procedure, giving the narrowest and most symmetric distribution of fit residuals, yields 87.3 ± 3.9%

Compton telescope with coded aperture mask: Imaging with the INTEGRAL/IBIS Compton mode

Compton telescopes provide a good sensitivity over a wide field of view in the difficult energy range running from a few hundred keV to several MeV. Their angular resolution is, however, poor and strongly energy dependent. We present a novel experimental design associating a coded mask and a Compton detection unit to overcome these pitfalls. It maintains the Compton performance while improving the angular resolution by at least an order of magnitude in the field of view subtended by the mask. This improvement is obtained only at the expense of the efficiency that is reduced by a factor of two. In addition, the background corrections benefit from the coded mask technique, i.e. a simultaneous measurement of the source and background. This design is implemented and tested using the IBIS telescope on board the INTEGRAL satellite to construct images with a 12' resolution over a 29 degrees x 29 degrees field of view in the energy range from 200 keV to a few MeV. The details of the analysis method and the resulting telescope performance, particularly in terms of sensitivity, are presented