Full Spine X-ray (Scoliosis Survey)

What it is

Most spine x-rays answer a local question: is this vertebra broken, is this disc space narrowed. A survey of the whole spine answers a geometric one. A curve has a top and a bottom, and the angle between them cannot be measured from an image that cuts off either end — so this study captures the thoracic and lumbar spine together on a single long exposure, taking in the neck, skull base and sacrum as far as they are relevant to the alignment being assessed. Only two or three views are taken, because the point is the overall shape, not detail at any one level.

That whole-spine geometry is also what makes the images comparable over time. A curve is followed by repeating the same view and re-measuring the angle, and small differences in how the patient was positioned or how much of the spine was included can swamp a real change.

Why it is done

• To confirm and measure a sideways curve of the spine suspected from a physical exam, since the curve on film is frequently larger than what is visible from the outside
• To follow a known curve over time — the reason the same view is repeated at intervals, particularly while a child is still growing
• To assess overall spinal balance, front to back as well as side to side, before and after treatment
• To see the relationship between the spine and the pelvis, which a region-limited film cannot show

What to expect

There is no preparation. You will usually be imaged standing, since the curve of a spine changes when weight comes off it, and you will be asked to stand in a specific posture with arms positioned a particular way — the same posture as at previous visits, so the films can be compared. Shielding may be offered for parts of the body outside the area being measured. The exposure itself is brief and the visit short. A radiologist measures the curve and reports the angle, which is the number that gets tracked from one visit to the next.

Questions worth asking

• Is this being read and measured by a radiologist, by the treating specialist, or both — and does each one bill?
• Since follow-up means repeating this study, how often is it expected, and what is the per-visit cost over that schedule?
• Does this facility use a low-dose or digital full-spine system, and is it priced differently from a standard one?
• Can the images be released to me on disc or through a portal so a second opinion does not require a repeat study?