lateral projection

lat·er·al pro·jec·tion

radiographic projection with the x-ray beam in a coronal plane.

lateral projection

a radiographic representation of the body produced by an x-ray beam that travels from the left to the right side of the body, or vice versa. It is a right lateral projection if the right side of the body is adjacent to the cassette and a left lateral projection if the left side is adjacent to it.

lateral projection

lateral radiograph of foot; X-ray tube is angled at 90° to sagittal plane with beam centred on hindfoot (see Table 1)
Table 1: Common radiographic projections of the foot and ankle
ProjectionVisualization
Foot projections
Dorsiplantar (DP) projection or anteroposterior (AP) viewWeight-bearing with the beam directed at 15° to the frontal plane, to eliminate distortion due to the angulation of the metatarsals and centred on the metatarsal shafts
It is used to visualize the phalanges, metatarsophalangeal joints, the metatarsals and the midfoot
Lateromedial oblique projectionWeight-bearing with the beam angled at 45° to the lateral side of the sagittal plane and centred on the forefoot; or non-weight-bearing, with the beam vertical and foot everted so that the plantar surface is at 45° to the ground surface
It is used to visualize the phalanges, metatarsals, metatarsocuneiform joints and sesamoids, but tends to give an elongated image of bony architecture
Mediolateral oblique projectionWeight-bearing with the beam angled between 25 and 45° to the medial side of the sagittal plane and centred on the forefoot
It is used to visualize the first ray and associated structures, but tends to give an elongated image of bony architecture
Lateral projectionWeight-bearing or non-weight-bearing, with the beam angled at 90° to the lateral aspect of the foot and centred on the mid- or hindfoot
It is used to visualize the profile of the whole foot, but obscures the midtarsal joint, due to superimposition of local structures
Digital projectionThe lateromedial oblique projection is useful to visualize subungual exostoses, especially when the hallux (or affected toe) is raised up on a pad
Sesamoid projection or skyline projectionWeight-bearing, with the metatarsophalangeal joints dorsiflexed to 45° and the beam angled to be parallel to the ground surface on the sagittal plane, and centred on the plantar aspect of the forefoot
It is used to visualize the relationship of the sesamoids with the head of the first metatarsal
Tarsal and ankle projections
Anteroposterior viewWeight-bearing with the beam angled at 90° to the frontal plane and the beam centred on the ankle joint
Used to visualize the ankle mortise and the trochlear surface of the talus
Axial calcaneal projectionWeight-bearing with the beam angled at 45° to the posterior aspect of the sagittal plane with the beam centred on the hindfoot
It is used to visualize calcaneal trauma
Harris-Beath projectionSimilar to the axial calcaneal projection, but the patient is positioned as if making a ski-jump, that is, weight-bearing with the foot dorsiflexed at the ankle and the beam angled at 45° to the posterior aspect of the sagittal plane with the beam centred on the ankle
It is used to visualize the subtalar joint where talar fusions are suspected
References in periodicals archive ?
the subject of the contract is mnostolava upper assembly-car purchase: - the maximum working height of at least 44 m - the maximum car load of 500 kg, - lateral projection of at least 25 m.
b) Left internal carotid injection in the lateral projection demonstrates a PTA (arrow).
3C; 4C); lateral projection absent; basal extension of pseudepiphallus short (visible in lateral view) (Figs.
A space-occupying mass, located at the cranial aspect of kidneys, was visible in the lateral projection.
On a CXR, retrosternal air is best seen in the lateral projection.
Having contacted the skin lateral to the projection of the C1 TVP, the palpator placed the radiopaque marker directly overlying the most lateral projection of the C1 TVP, avoiding as much as possible soft tissue slippage during the process.
Radiographic signs on lateral projection include translation of the vertebral body up to 25% of the anteroposterior diameter of the adjacent vertebral body, focal kyphosis, reduced overlap of the articular processes and fanning or widening of the interspinous distance.
In all three cases, position of the tip of lag screw in femoral head was central in AP and central in Lateral projection.
Triceps skin fold thickness was measured at midway between the lateral projection of the acromion process of the scapular and the inferior margin of the olecranon process of the ulna.
Septal puncture was done in the left lateral projection.
infiltrates and miliary TB), the lateral projection was found to be more accurate in detecting hilar lymphadenopathy by Smuts et al.
Basal tarsomere semicylindrical, second one with small lateral projection and dorsal apical margin with two short spiniform projections; third tarsomere with lateral lobes well developed; fourth tarsomere cylindrical, flattened dorsoventrally, with a length equal to sum of median dorsal portion of first and second tarsomeres.

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