Radiological imaging device comprising, - a gantry defining an analysis area suitable to contain at least a portion of a patient to be analysed and a circular extension trajectory extending around a central axis; - said gantry comprising ∘ a source suitable to emit radiation; ∘ a detector suitable to receive said radiation after said radiation has passed through said analysis area; and ∘ a casing defining a housing volume for at least said source and said detector; said casing comprising - a bottom arched module, - at least one arched module mobile (232a, 232b) with respect to said bottom arched module so as to vary the angular extension of said casing and, thus, of said housing volume keeping said source and said detector in said housing volume; - said gantry comprising, outside said housing volume, a movement apparatus suitable to move said arched modules (231, 232a, 232b) and comprising - at least one bottom guide integral with said bottom arched module and defining a circular movement bottom trajectory substantially centred with respect to said central axis; - at least one mobile guide integral with said at least one mobile arched module (232a, 232b) and defining a circular movement mobile trajectory substantially centred with said central axis; - at least one thrust assembly suitable to engage said guides (241, 242), ordering the rotation of at least part of said arched modules (231, 232a, 232b) around said central axis so as to vary the angular extension of said casing keeping said source and said detector in said housing volume; and - characterised in that said gantry comprises a first support constraining said source to said bottom arched module and a second support constraining said detector to one of said at least one arched mobile modules (232a, 232b). - a gantry defining an analysis area suitable to contain at least a portion of a patient to be analysed and a circular extension trajectory extending around a central axis; - said gantry comprising ∘ a source suitable to emit radiation; ∘ a detector suitable to receive said radiation after said radiation has passed through said analysis area; and ∘ a casing defining a housing volume for at least said source and said detector; ∘ a source suitable to emit radiation; ∘ a detector suitable to receive said radiation after said radiation has passed through said analysis area; and ∘ a casing defining a housing volume for at least said source and said detector; - a bottom arched module, - at least one arched module mobile (232a, 232b) with respect to said bottom arched module so as to vary the angular extension of said casing and, thus, of said housing volume keeping said source and said detector in said housing volume; - said gantry comprising, outside said housing volume, a movement apparatus suitable to move said arched modules (231, 232a, 232b) and comprising - at least one bottom guide integral with said bottom arched module and defining a circular movement bottom trajectory substantially centred with respect to said central axis; - at least one mobile guide integral with said at least one mobile arched module (232a, 232b) and defining a circular movement mobile trajectory substantially centred with said central axis; - at least one thrust assembly suitable to engage said guides (241, 242), ordering the rotation of at least part of said arched modules (231, 232a, 232b) around said central axis so as to vary the angular extension of said casing keeping said source and said detector in said housing volume; and - characterised in that said gantry comprises a first support constraining said source to said bottom arched module and a second support constraining said detector to one of said at least one arched mobile modules (232a, 232b).