Supine and erect pelvis radiographs: A pilot study
Research type
Research Study
Full title
A pilot study to compare supine and erect pelvis radiographs – assessment of impact on radiation dose and diagnostic quality
IRAS ID
234096
Contact name
Kevin Flintham
Contact email
Sponsor organisation
Mid Yorkshire Hospitals NHS Trust
Duration of Study in the UK
0 years, 8 months, 31 days
Research summary
X-ray images are a primary tool in investigating hip diseases. Their reproducibility is important for diagnosis and monitoring of arthritis and hip replacement surgery. Pelvis x-rays are performed with the patient lying down, however studies have shown that standing is more effective, demonstrating abnormalities taking into consideration the effect of load. Previous research demonstrated that the pelvis tilts with different postures (lying / standing) and understanding these changes to the x-ray is vital. Importantly, no research has considered radiation dose implications of changing from supine to standing technique.
This pilot study will examine differences in diagnostic markers and radiation dose between the positions in three phases. To estimate changes in patient soft tissue anatomy between supine and erect positions in phase one we will recruit 180 patients referred for pelvis radiographs to have their height, weight and trunk diameter/circumference measured whilst erect and supine. This data will allow modelling of changes in body shape between the projections. For phase two an anthropomorphic phantom will be utilised, establishing the imaging protocol to provide suitable quality images with the lowest radiation dose. The third study phase will recruit 60 patients who have been referred for pelvis x-rays who will have their imaging performed in both lying and standing positions. The recruitment and refusal rates will inform future study design and sample size. The data will assist in determining variation in radiation dose, anatomical measures for hip disease and anatomy between positions.
A key outcome will be a grant application to determine if patient posture affects clinical outcomes, in terms of image quality or radiation dose received by the patient. We will explore whether the standing position is acceptable to patients. The study outcomes will support future research development seeking to identify the clinical impact of erect pelvic radiographs in a larger population.REC name
Yorkshire & The Humber - South Yorkshire Research Ethics Committee
REC reference
17/YH/0363
Date of REC Opinion
14 Dec 2017
REC opinion
Further Information Favourable Opinion