Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Tc-99m DMSA SPECT for Follow-Up of Non-Operative Treatments in Renal Injuries: A Prospective Single-Center Study

  • Sang-Geon Cho (Department of Nuclear Medicine, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Ki Seong Park (Department of Nuclear Medicine, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Jahae Kim (Department of Nuclear Medicine, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Jang Bae Moon (Department of Nuclear Medicine, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Ho-Chun Song (Department of Nuclear Medicine, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Taek Won Kang (Department of Urology, Chonnam National University Hospital, Chonnam National University Medical School) ;
  • Seong Hyeon Yu (Department of Urology, Chonnam National University Hospital, Chonnam National University Medical School)
  • Received : 2023.02.22
  • Accepted : 2023.07.17
  • Published : 2023.10.01
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Abstract

Objective: The assessment of cortical integrity following renal injuries with planar Tc-99m dimercaptosuccinic acid (DMSA) scintigraphy depends on measuring relatively decreased cortical uptake (i.e., split renal function [SRF]). We analyzed the additive values of the volumetric and quantitative analyses of the residual cortical integrity using single-photon emission computed tomography (SPECT) compared to the planar scintigraphy. Materials and Methods: This prospective study included 47 patients (male:female, 32:15; age, 47 ± 22 years) who had non-operatively managed renal injuries and underwent DMSA planar and SPECT imaging 3-6 months after the index injury. In addition to planar SRF, SPECT SRF, cortical volume, and absolute cortical uptake were measured for the injured kidney and both kidneys together. The correlations of planar SRF with SPECT SRF and those of SRF with volumetric/quantitative parameters obtained with SPECT were analyzed. The association of SPECT parameters with renal function, grades of renal injuries, and the risk of renal failure was also analyzed. Results: SPECT SRF was significantly lower than planar SRF, with particularly higher biases in severe renal injuries. Planar and SPECT SRF (dichotomized with a cutoff of 45%) showed 19%-36% of discrepancies with volumetric and quantitative DMSA indices (when dichotomized as either high or low). Absolute cortical uptake of the injured kidney best correlated with glomerular filtration rate (GFR) at follow-up (ρ = 0.687, P < 0.001) with significant stepwise decreases by GFR strata (90 and 60 mL/min/1.73 m2). Total renal cortical uptake was significantly lower in patients with moderate-to-high risk of renal failure than those with low risk. However, SRF did not reflect GFR decrease below 60 mL/min/1.73 m2 or the risk of renal failure, regardless of planar or SPECT (count- or volume-based SRF) imaging. Conclusion: Quantitative measurements of renal cortical integrity assessed with DMSA SPECT can provide more clinically relevant and comprehensive information than planar imaging or SRF alone.

Keywords

Acknowledgement

This study was supported by a grant (BCRI22027, Principal Investigators: Sang-Geon Cho and Seong Hyeon Yu) from Chonnam National University Hospital Biomedical Research Institute.

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