Stereo Photogrammetry vs Computed Tomography for 3D Medical Measurements

Abstract

The acquisition of 3D body measurements by computer vision-based remote sensing is becoming extremely substantial in clinical studies nowadays. Thus, accurate 3D models of human anatomical surfaces are required in many clinical routines like disease diagnosis, patient follow-up, surgical planning, computer assisted surgery and different biomechanical applications. These models can be generated from different imaging techniques such as computed tomography (CT). However, 3D conventional medical imaging like CT scan have serious limitations in application such as exposing the patient to ionizing radiation due to repeated scans, highly cost imaging process, failure to provide color texture information, and also lacking to apply the process in standing position. Recently 3D model reconstruction using stereo-photogrammetry have been taken into consideration as a reliable alternative technique to CT scan. This is particularly true because photogrammetry can achieve accurate 3D models with low cost and high accuracy results and further considered a non-invasiveness and non-irradiating technique if compared to CT imaging. In this paper, 3D digital models generated by close range photogrammetry (CRP), is investigated for validation against CT scan models (Stereo-Lithography (STL)) which expressed as gold standard models. This is particularly applied to propose using CRP as an alternative nonirradiated solution to X-ray radiated imaging to provide accurate 3D measurements for plastic surgery treatment in certain medical cases. Two 3D plastic models used as test objects in this research and therefore scanned by CT scan device and hand-held digital camera. The accuracy assessment was carried out using cloud-to-mesh (C2M) function followed by co-registration process between each pair of 3D corresponding surfaces. The C2M deviation distances computed and analyzed for all tested models. The RMSE values for deviation distances between individual pairs of 3D corresponding surfaces were found to be several parts from millimeter in both tested objects. Statistical analysis was also applied which shows no significant differences between both compared generated models. Validation measurements of specific regions within the models were carried out by computing the relative difference between both techniques which found to be clinically adequate and medically accepted for application.

Underwater photogrammetry for close‐range 3D imaging of dry‐sensitive objects: The case study of cephalopod beaks

“…As this part is not used for identification, this photogrammetry protocol can at least be used for taxonomic studies. as CT scanning, (Giacomini et al, 2019;Hussien et al, 2019), laser scanning (Baltsavias, 1999;Gibelli et al, 2018), surface scanning (Fau et al, 2016) and its accuracy and precision has been demonstrated (Bythell et al, 2001;De Menezes et al, 2010;Figueira et al, 2015;Varón-González et al, 2020). Here, we show that differences between models produced by photogrammetric means and micro-CT are small and should not impact species identification or morphometric analyses.…”

“…Three dimension models, whether derived from photogrammetry or tomography, are always an interpretation of real objects. A lot of methods have been compared with photogrammetry, such as CT scanning, (Giacomini et al., 2019; Hussien et al., 2019), laser scanning (Baltsavias, 1999; Gibelli et al., 2018), surface scanning (Fau et al., 2016) and its accuracy and precision has been demonstrated (Bythell et al., 2001; De Menezes et al., 2010; Figueira et al., 2015; Varón‐González et al., 2020). Here, we show that differences between models produced by photogrammetric means and micro‐CT are small and should not impact species identification or morphometric analyses.…”

Analysis of the Influence of the Geometrical Parameters of the Body Scanner on the Accuracy of Reconstruction of the Human Figure Using the Photogrammetry Technique

“…Scanning systems based on the photogrammetry technique are of interest to many industries. In the field of human scanning, it is possible to mention, among others, virtual fitting rooms [ 7 ], fitness and sport [ 8 ], education [ 9 ], as well as health and medicine [ 10 , 11 , 12 , 13 , 14 ]. Typically, as a result, the scanning of stationary models has been obtained, although attempts have also been made to create interactive models, which may be used, for example, in the education of anatomy [ 15 ].…”

Accuracy Assessment of Establishing 3D Real Scale Model in Close-Range Photogrammetry with Digital Camera

“…Also, it is used in topography and landslide measurements [1], monitoring slope displacement [5], buildings and structures deformation monitoring [13], and traffic accident management [14]. Moreover, digital close-range photogrammetry is widely used in industry [15,16,17,18,19], archaeology [20], architectural and cultural heritage documentation [21,22], agriculture [23], mineralogy [24], and clinical and medical applications [25].…”