Comparison of kidney‐ureter‐bladder abdominal radiography and computed tomography scout films for identifying renal calculi

Johnston, Richard B.; Lin, Tony; Du, Jason; Mark, Stephen

doi:10.1111/j.1464-410x.2009.08542.x

Cited by 57 publications

(25 citation statements)

References 17 publications

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“…A very important finding was that all kidney stones visible on the CTI also were visible on the KUB (PPV 100%). This finding corresponds well with previous studies [7][8][9]. In case of CTI negative kidney stones in our data a subsequent KUB would have found it radiopaque in 25% of cases (11/43).…”

Section: Discussionsupporting

confidence: 93%

“…In case of CTI negative kidney stones in our data a subsequent KUB would have found it radiopaque in 25% of cases (11/43). One other study showed a similar result (33%) [9] (Fig. 3).…”

Section: Discussionsupporting

confidence: 74%

“…Only very sparse data exist in the literature on the clinical use of the CTI [4][5][6][7][8][9]. One recent study [9] reported radiopacity on KUB (63%) and CTI (47%). This corresponds quite well to our data, in which kidney stones were seen on the KUB (71%) versus 57% on CTI.…”

Section: Discussionmentioning

confidence: 99%

“…In one study CTI was performed with a total of 50 mA [9]. In our NCHCT protocol the CTI AP image is generated at 10 mA.…”

Section: Discussionmentioning

confidence: 99%

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Can the CT planning image determine whether a kidney stone is radiopaque on a plain KUB?

et al. 2011

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Almost all kidney stones are CT positive. Before a CT scan can be done a CT planning image (CTI) is generated in order to select the exact scanning area. The CTI looks approximately like a normal kidney-ureter-bladder abdominal radiography (KUB) but with reduced quality. It has been used as a guide, assuming that if the kidney stone could be seen on the CTI the kidney stone also would be visible on a conventional plain KUB (radiopaque). From the perspective of diagnosis and treatment as well as follow-up it is of importance to know whether a kidney stone is radiopaque or not. The aim of this study was to evaluate whether the CTI actually can predict radiopacity. CT scans and corresponding KUB's were analysed in 76 consecutive kidney stone patients. The CT scan and the KUB were performed on the same day. All patients were examined with the same CT scanner (64 slice GE light speed VCT). Three radiologists evaluated the images in plenum. The following was recorded regarding the kidney stones: X-ray positive (radiopaque on KUB), CTI positive (radiopaque on CTI), location (a kidney, b upper two-thirds of ureter and c lower one-thirds of ureter including the bladder), size and Hounsfield units (HU). We also measured the patient's 'anterior-posterior depth' (APD) at the kidney stone level in axial plane, and whether the stone was homogeneous/inhomogeneous. 54 of the 76 patients (71%) had radiopaque stones on KUB. 43 (57%) of these also could be seen on the CTI, resulting in a positive predicting value (PPV) of 100% and a negative predictive value (NPV) of 67%. In the 54 KUB positive kidney stones the mean kidney stone diameter was 7 mm (2-30 mm), mean HU's 1,007 (294-1,782 HU), location: a:32, b:9 and c:13 patients. APD was mean 23.6 cm (13-39 cm). In the KUB positive and CTI negative kidney stones (11 patients) mean kidney stone diameter was 4 mm (2-9 mm), mean HU's 742 (294-1,253 HU), location: a:32, b:9 and c:13 patients. APD in this group was mean 26.1 cm (13-37 cm). If the kidney stone can be seen on the CTI it is also visible on a plain KUB (PPV 100%). The CTI do, however, underestimate the radiopacity of a stone on a plain KUB (NPV 67%). Kidney stone HU > 742, stone location in the kidney and proximal ureter and APD < 26 cm independently predict agreement between CTI and KUB with regard to radiopacity.

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Section: Discussionsupporting

confidence: 93%

“…In case of CTI negative kidney stones in our data a subsequent KUB would have found it radiopaque in 25% of cases (11/43). One other study showed a similar result (33%) [9] (Fig. 3).…”

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

“…In one study CTI was performed with a total of 50 mA [9]. In our NCHCT protocol the CTI AP image is generated at 10 mA.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Can the CT planning image determine whether a kidney stone is radiopaque on a plain KUB?

et al. 2011

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“…KUB film has a limited sensitivity for the detection of urolithiasis, but the specificity is acceptable [20]. KUB film could be used for follow-up in 63% of cases [21]. All stones observed on NCCT were also visible on the KUB film, which has been the preferred modality for follow-up imaging if the stone was visible on the initial film.…”

Section: Discussionmentioning

confidence: 99%

Is Bilateral Ureterorenoscopy the First Choice for the Treatment of Bilateral Ureteral Stones? An Updated Study

et al. 2012

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Introduction: We analyze our recent results and discuss the advantages and disadvantages of bilateral single-session ureterorenoscopy (URS) for bilateral ureteral stones. Patients and Methods: 55 patients underwent URS with pneumatic lithotripsy (PL) for bilateral stones. 61 (55.5%), 28 (25.4%) and 21 (19.1%) stones were located in the lower, middle and upper ureter, respectively. Results: Of the 110 stones, 99 (90.0%) were fragmented in a single procedure. The stone clearance rate was 94.5% after the second session. The stone clearance rates with regard to stone location were 71.4, 89.3 and 96.7% for the upper, middle and lower ureter, respectively. An analysis of the clearance rates based on location demonstrated that lower ureteric stones were more successfully removed than upper ureteric stones (96.7 vs.71.4%, p = 0.003). Conclusion: Bilateral single-session URS with PL is a highly effective treatment modality for bilateral ureteral stones. The success rate of PL is affected by stone size and location.

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Renal Colic and Obstructing Kidney Stones: Diagnosis and Management

Miller

Stoller

2013

Urological Emergencies

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Comparison of kidney‐ureter‐bladder abdominal radiography and computed tomography scout films for identifying renal calculi

Cited by 57 publications

References 17 publications

Can the CT planning image determine whether a kidney stone is radiopaque on a plain KUB?

Can the CT planning image determine whether a kidney stone is radiopaque on a plain KUB?

Is Bilateral Ureterorenoscopy the First Choice for the Treatment of Bilateral Ureteral Stones? An Updated Study

Renal Colic and Obstructing Kidney Stones: Diagnosis and Management

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