How is source-to-object distance calculated?

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Study for the Clover Learning Radiography Image Evaluation and Quality Control Test. Use flashcards and multiple choice questions, each with hints and explanations. Ensure exam preparedness!

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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