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Impact of Scanner Speed On the Rate of Radiologist Complaint of Motion Artifact On Pediatric Body CT

M Lipford*, T Szczykutowicz, University Wisconsin-Madison, Madison, WI


(Sunday, 7/12/2020)   [Eastern Time (GMT-4)]

Room: AAPM ePoster Library

Purpose: Motion artifact can compromise the ability for radiologists to make an accurate diagnosis. Motion is especially prevalent in pediatric CT body exams. In this study, we examine the rate of radiologist complaint of motion in their reports in relationship to patient age and scanner speed/scan duration.

Methods: We searched 1,397 radiologist reports for mention of motion artifact on CT body exams (chest and/or abdomen/pelvis) from patient age’s 0-18. For each exam, using DICOM header data we calculated scan speed and total scan duration. We examined the dependence of rate of motion complaint on patient age, CT scan speed, and exam type (trauma vs. non-trauma) and performed Chi-squared testing. When comparing scan speed, we binned speed into increments of 50mm/s.

Results: Via a Chi-squared test, there is no relationship between the rate of motion complaint and the four pediatric radiologist who read a majority (63%) of the exams included in this study (p=0.53). The overall rate of motion complaint was 4.2% across all exams. However, there is a significantly higher rate of motion for children less than 10 y.o. vs. those >=10 y.o.: 8.9% vs 2.2% (p<0.0001). For children under 10 y.o., there is a decreasing rate of motion complaint with increasing scan speed: 0-50mm/s: 16.2±4.3%, 51-100mm/s: 9.5±2.0%, 251-300mm/s: 1.8±1.3% which represent a significant change with speed (p=0.001).

Conclusion: Faster scan speeds for pediatric body CT exams lead to less radiologist complaints of motion. One should scan pediatrics at the fastest scan speed possible in order to limit the negative effects of motion artifacts in CT.

Funding Support, Disclosures, and Conflict of Interest: TPS consultant GE Healthcare, supplies CT protocols under a licensing agreement to GE Healthcare, founder LLC, CAB and consultant to iMALOGIX, consultant Takeda Pharmaceuticals


Motion Artifacts, CT, Patient Movement


IM- CT: Quality Control and Image Quality Assessment

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