Image quality of a portable X-ray device (Nomad Pro 2) compared to a wall-mounted device in intraoral radiography

Table 1 Compared variables between the Nomad Pro 2 and the Heliodent Plus (according to [9]; mandatory criteria for bite wing images^a)

Variable	Dichotomic scale
Complete imaging of diagnostically relevant structures with as little geometrical distortion as possible^a	Yes/no
Display of the periodontal gap and the lamina dura	Yes/no
Display of the periradicular bone structure	Yes/no
Display of the alveolar crest	Yes/no
Display of the pulp cavity and root canals	Yes/no
Display of the entire dental crown including the proximal region^a	Yes/no
Overlay effect on relevant structures	Yes/no
Receptacle voltage ≥ 60 kilovolts (kV)^a	Yes/no
Nominal focal spot value ≤ 1.5^a	Yes/no
Size of the radiation field at the end of the tube ≤ 60 mm diameter^a	Yes/no
Blanking to film format, if possible and reasonable	Yes/no
Distance from tube end to focus ≥ 200 mm^a	Yes/no
Image receiver dose ≤ 200 μGy^a	Yes/no
Spatial resolution: ≥ 5 line pairs/mm [11]^a	Yes/no