[Verse 1]
Forget the echo guess, the magnet tells it straight,
Cardiac MRI's the judge, the reference, the real weight,
Slices stack like pages in the right ventricle's book,
End-diastole swells, end-systole takes a look,
Index every volume to the body surface size,
A six-foot forward and a jockey ain't the same prize,
RVEDVi, RVESVi, write it on the chart,
Ejection fraction tells you how the failing pump departs,
Pulmonary regurgitant fraction, backward leaking flow,
The valve that's torn keeps spilling blood the way it shouldn't go.
[Chorus]
RVEDVi, don't let it climb,
Past one-seventy, you're out of time,
RVESVi, eighty-five's the wall,
Oosterhof trims it — sixty, eighty-two, that's all,
Measure it, index it, body surface led,
Miss the window and the muscle stays ahead.
[Verse 2]
Phase-contrast mapping, velocity in color bands,
Main PA, left branch, right branch, flow across the lands,
Forward minus backward, divide it, get percent,
Forty and above is severe, the valve's a tattered tent,
Compare the branches side by side like weighing twins on scales,
If one lung's starved of flow while the other one prevails,
That whisper in the numbers names a stenosis down the pipe,
Narrowed vessel, pressure drop, a plumbing problem's type.
[Chorus]
RVEDVi, don't let it climb,
Past one-seventy, you're out of time,
RVESVi, eighty-five's the wall,
Oosterhof trims it — sixty, eighty-two, that's all,
Measure it, index it, body surface led,
Miss the window and the muscle stays ahead.
[Verse 3]
Therrien watched the muscle after valve got swapped in 'oh-five,
Past one-seventy a meter squared, the chamber won't revive,
Eighty-five on the systolic side, the shrink just will not come,
Oosterhof refined the fence, trimmed down the sum,
One-sixty the new ceiling, eighty-two the tighter gate,
Operate before the crossing, don't go sealing in the fate,
The ventricle's a sponge that hardens if you squeeze too late,
Remodeling's a narrow door — timing is the weight.
[Bridge]
Late gadolinium lingers where the muscle turned to scar,
Bright patches on the right side, dimmer streaks dropped from afar,
Scar tissue doesn't conduct, doesn't squeeze, just sits there pale,
Map it on the septum too, it carries half the tale,
Four-D flow's a weather map inside the conduit's bend,
Vortices spin energy loss round every curve and end,
Watch the streamlines fork and tumble, branch by branch they spread,
Where the swirl turns chaotic, turbulence ahead.
[Verse 4]
But metal hates the magnet — pacemaker, ICD, a stent,
Each one throws a penumbra, a shadowed signal dent,
Penumbra — that's the half-lit blur where true image can't be read,
A dark corona round the device, confusing what's ahead,
Conditional devices, sequences that dodge the static cloud,
CT steps in as alternate when the magnet's not allowed,
That's a chapter waiting — for now just bank the sense,
Metal speaks a foreign tongue to magnetism's immense.