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Objective <p>The diagnostic efficacy of LD CTA for rotator cuff pathology and labral lesions of the shoulder was compared to SD CTA.</p> Materials and methods <p>Two radiologists analyzed 60 shoulder CTAs with SD (<i>n</i> = 25) and LD (<i>n</i> = 35) protocol with suspected rotator cuff tears (RCT) or labral lesions. Qualitative evaluation of images regarding contrast and noise was done twice, using a 5-point Likert scale. Quantitative evaluation was done, by measuring HUs of intra-articular contrast, tissues, background noise, CNR (contrast-to-noise ratios), and FOM (figure of merits). The presence/extent of RCT and presence/type of labral lesions were evaluated on CTA and 3&#xa0;T MRI; MRI results were used as the reference standard. Quantitative variables were compared using independent <i>t</i> test, whereas qualitative ordinal variables were compared using Fisher’s exact test. Interobserver agreement was assessed using intraclass correlation coefficients for quantitative variables and weighted kappa statistics for qualitative ordinal variables.</p> Results <p>CTA with LD protocol showed 31% radiation dose reduction ((4.80–3.29)/4.80*100%; <i>p</i> = .0001). Background noise was significantly lower in LD protocol (LD 11.04 vs. SD 16.21 HU; <i>p</i> = .003). Sensitivity and specificity of SD CTA were 93.7% (15/16) and 66.7% (6/9), respectively; those of LD CTA were 88% (22/25) and 80% (8/10), respectively, for labral lesions. For diagnosis of RCT, sensitivity and specificity of SD CTA were 40% (4/10) and 100% (15/15), respectively; those of LD CTA were 53.8% (7/13) and 100% (22/22).</p> Conclusion <p>LD CTA showed comparable image quality, lower background noise, and similar diagnostic efficacy in diagnosis of RCT and labral lesions at 31% reduced dose.</p>

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Usefulness of low dose (LD) CT arthrography (CTA) of the shoulder in diagnosis of rotator cuff pathology and SLAP lesions: comparison with standard dose (SD) CTA and correlation with MRI

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Yeong Seo Yoo,
  • Kyoung Yeon Lee,
  • Jung-Ah Choi

摘要

Objective

The diagnostic efficacy of LD CTA for rotator cuff pathology and labral lesions of the shoulder was compared to SD CTA.

Materials and methods

Two radiologists analyzed 60 shoulder CTAs with SD (n = 25) and LD (n = 35) protocol with suspected rotator cuff tears (RCT) or labral lesions. Qualitative evaluation of images regarding contrast and noise was done twice, using a 5-point Likert scale. Quantitative evaluation was done, by measuring HUs of intra-articular contrast, tissues, background noise, CNR (contrast-to-noise ratios), and FOM (figure of merits). The presence/extent of RCT and presence/type of labral lesions were evaluated on CTA and 3 T MRI; MRI results were used as the reference standard. Quantitative variables were compared using independent t test, whereas qualitative ordinal variables were compared using Fisher’s exact test. Interobserver agreement was assessed using intraclass correlation coefficients for quantitative variables and weighted kappa statistics for qualitative ordinal variables.

Results

CTA with LD protocol showed 31% radiation dose reduction ((4.80–3.29)/4.80*100%; p = .0001). Background noise was significantly lower in LD protocol (LD 11.04 vs. SD 16.21 HU; p = .003). Sensitivity and specificity of SD CTA were 93.7% (15/16) and 66.7% (6/9), respectively; those of LD CTA were 88% (22/25) and 80% (8/10), respectively, for labral lesions. For diagnosis of RCT, sensitivity and specificity of SD CTA were 40% (4/10) and 100% (15/15), respectively; those of LD CTA were 53.8% (7/13) and 100% (22/22).

Conclusion

LD CTA showed comparable image quality, lower background noise, and similar diagnostic efficacy in diagnosis of RCT and labral lesions at 31% reduced dose.