Polygon under/touching Linestring

[Gozas Litho]

Dear friends,

I have a bunch of polygons defined and I would like to find out which of them are under a StringLine.

I tried with:
1#
SELECT id, AsText(g) AS myPolygon
FROM flst WHERE MBRIntersects(LineStringFromText('LINESTRING(4480611.9803 5551488.0621,4480804.8855 5551431.9080)'), g);

-> The result isn’t good enough because there is being used the boundary(=Big rectangle) of the StringLine
Even with the function Intersects() I have the same results.

2#
I have also tried with touches():
i.e.: touches(g, LineStringFromText('LINESTRING(x1 y1,x2 y2)'))
or: touches(LineStringFromText('LINESTRING(x1 y1,x2 y2)'), g)

Both times I had a null result.

- Is there another function that I can use?
- Am I using the false geometries?

Thank you for your help.
I am looking forward to hearing from you