1. Introduction
According to the World Health Organization (WHO), simple ultrasound (US) or X-rays can cover the needs of approximately two-thirds of diagnostic imaging services [1]. However, there is a widespread inequality in global medical resources, with US imaging in remote areas being resource-intensive, which makes high-quality US services inaccessible for the residents of such areas [2]. Instead, they are required to travel to distant general medical centers for US services. Additionally, the ageing of the global population is increasingly becoming a serious issue; it is becoming more difficult for numerous elderly people in remote rural areas to receive timely medical services.
With the development of newer technologies, US equipment has become miniaturized [3,4]. Novel handheld ultrasound (HHUS) devices are the latest type of US equipment. Due to its portability, low cost,…
