É bem provável que não. Essas "manchas" escuras geralmente são apenas ar do sistema digestório próximo ao colon transverso descendente e cólon sigmoide.
A pelvis xray should not include L2, L3 and L4. They should be collimated out of the primary beam. I would fail a student for producing the image you display as typical for pelvis. To correct your technique, begin by collimating to the size of the cassette, then used the illumination from the collimator to guide your positioning - ie ensure the iliac crests will appear on the resultant radiograph
