How is source-to-object distance calculated?

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Prepare for the Clover Learning Radiography exam. Master image evaluation and quality control with questions and detailed explanations. Enhance your skills and be exam ready!

Multiple Choice

How is source-to-object distance calculated?

Explanation:
Source-to-object distance is the distance from the X-ray tube (the source) to the part of the patient being imaged. The total distance from source to image receptor (SID) equals the sum of that distance (SOD) and the distance from the object to the receptor (OID). So the source-to-object distance is SID minus OID. For example, with a SID of 100 cm and an OID of 10 cm, the SOD is 90 cm. This relationship also shows why increasing OID (with SID fixed) makes the image larger (more magnification) because it reduces the SOD, and magnification M equals SID divided by SOD.

Source-to-object distance is the distance from the X-ray tube (the source) to the part of the patient being imaged. The total distance from source to image receptor (SID) equals the sum of that distance (SOD) and the distance from the object to the receptor (OID). So the source-to-object distance is SID minus OID. For example, with a SID of 100 cm and an OID of 10 cm, the SOD is 90 cm. This relationship also shows why increasing OID (with SID fixed) makes the image larger (more magnification) because it reduces the SOD, and magnification M equals SID divided by SOD.

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