Comparison of Computed Radiography and Conventional Radiography in Detection of Small Volume Pneumoperitoneum

Marolf, Angela J.; Blaik, Margaret A.; Ackerman, N; Watson, Elizabeth; Gibson, Nicole; Thompson, Margret S.

doi:10.1111/j.1740-8261.2008.00355.x

Cited by 12 publications

(17 citation statements)

References 15 publications

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“…Our findings were similar to that of Marolf et al, where horizontal beam projections were not significantly more sensitive than standard projections in identifying pneumoperitoneum . This was unexpected as horizontal beam radiography has been thought to be more sensitive than standard projections in differentiating gastrointestinal gas from free peritoneal gas .…”

Section: Discussionsupporting

confidence: 90%

The left lateral projection is comparable to horizontal beam radiography for identifying experimental small volume pneumoperitoneum in the canine abdomen

Ng¹,

Linn²,

Shmon³

et al. 2019

Vet Radiology Ultrasound

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Nontraumatic spontaneous pneumoperitoneum suggests the presence of gastrointestinal perforation; early detection can be lifesaving. Horizontal beam projections have been reported to be more sensitive than standard radiographic views for detecting small volumes of free peritoneal gas. This prospective, experimental, analytical study compared both left lateral (LL) and ventrodorsal (VD) standard views to horizontal beam projections for detecting small volumes of artificially induced pneumoperitoneum in live dogs. The effect of radiology training on accurate detection of small amounts of free peritoneal air was also assessed. Fourteen dogs had four radiographic projections taken after injection of 0, 2.5, 5, and 10 mL of cumulative air into their abdominal cavities. Radiographs were interpreted individually by three American College of Veterinary Radiology‐certified radiologists and three small animal internship‐trained veterinarians who were blinded to the air volume injected. At 2.5 and 10 mL of air injected, the LL projection had highest odds of an accurate response (odds ratio [OR] = 2.4 and 99.0 when compared to VD horizontal and VD projections, respectively). At 5 mL of air injected, the lateral horizontal (LH) projection had the highest odds of an accurate response (OR = 3.2 compared to VD horizontal). The LL projection was not significantly different from the LH projection at all volumes of air injected. Board certification led to higher odds of accurate responses at volumes of 5 (OR = 2.2) and 10 mL (OR = 3.6), as compared to nonspecialist veterinarians. Overall, LH and standard LL appeared to be the most useful radiographic projections for detection of small amounts of free peritoneal gas.

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Section: Discussionsupporting

confidence: 90%

The left lateral projection is comparable to horizontal beam radiography for identifying experimental small volume pneumoperitoneum in the canine abdomen

Ng¹,

Linn²,

Shmon³

et al. 2019

Vet Radiology Ultrasound

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“…However, despite lower spatial resolution of CR compared to conventional radiography, contrast resolution of CR is higher because of edge enhancement filters incorporated in the image reconstruction algorithm, ability to manipulate the image and a wider dynamic range for image processing . Overall, CR often has superior image quality as compared to conventional radiography and is associated with equal or higher diagnostic performance for soft tissue and osseous lesions, and it is unlikely the use of CR influenced accuracy of vertebral measurements and SRVs in our study.…”

Section: Discussionmentioning

confidence: 72%

Repeatability and Intra‐ and Inter‐observer Agreement of Cervical Vertebral Sagittal Diameter Ratios in Horses with Neurological Disease

Hughes

Laidlaw

Reed

et al. 2014

Veterinary Internal Medicne

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BackgroundSagittal ratio values (SRVs) of cervical vertebrae are used for ante‐mortem diagnosis of cervical vertebral stenotic myelopathy, but intraobserver and interobserver variability in measurement may influence radiographic interpretation of vertebral stenosis in horses with neurological disease.ObjectivesTo determine intraobserver repeatability in SRVs, intra‐ and interobserver agreement in SRVs and whether or not agreement was influenced by animal age.AnimalsForty‐two horses (>1 year old) with neurological disease from which laterolateral computed radiographic images of C2–C7 were obtained.MethodsFour observers made measurements from C2 to C7 for each horse and interobserver agreement for intra‐ and intervertebral SRVs was determined using Bland–Altman analysis (acceptable agreement: limits of agreement [LOA] ≤ 0.05) on all horses and those ≤3 (n = 25) and >3 (n = 17) years old. Each observer also made repeated measurements for 10 horses and intraobserver repeatability and agreement were determined.ResultsAdequate intraobserver repeatability was achieved for 6 sites. Within observers, paired measurements had a median difference ≤5.7%, but a large range in differences often occurred, most frequently at intervertebral sites. For C5, C6, C7, and C3–4, LOA ≤ 0.05 were achieved by at least 1 observer. With the exception of C5 for 1 pair, LOA were >0.05 for interobserver agreement, regardless of animal age. LOA were largest at intervertebral sites.Conclusions and Clinical ImportanceWithin and between observers, measurement error may limit the diagnostic accuracy of SRVs and result in discrepancies of diagnosis and treatment and warrants consideration when used clinically in horses with neurological disease.

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“…26 The greater dynamic range of digital images and improved contrast resolution accentuates differences in opacity between tissues of different composition. 27,28 The quality of digital radiography could also be the reason for some false-positive lesions of the medial trochlear ridge. In two out of four cases, a discrete circular radiolucent area was detected in the proximal part of the medial trochlear ridge on LM (one of two) or both radiographic views (one of two).…”

Section: Discussionmentioning

confidence: 99%

Diagnostic Sensitivity and Interobserver Agreement of Radiography and Ultrasonography for Detecting Trochlear Ridge Osteochondrosis Lesions in the Equine Stifle

Beccati

Chalmers

Dante

et al. 2012

Vet Radiology Ultrasound

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Osteochondrosis lesions commonly occur on the femoral trochlear ridges in horses and radiography and ultrasonography are routinely used to diagnose these lesions. However, poor correlation has been found between radiographic and arthroscopic findings of affected trochlear ridges. Interobserver agreement for ultrasonographic diagnoses and correlation between ultrasonographic and arthroscopic findings have not been previously described. Objectives of this study were to describe diagnostic sensitivity and interobserver agreement of radiography and ultrasonography for detecting and grading osteochondrosis lesions of the equine trochlear ridges, using arthroscopy as the reference standard. Twenty-two horses were sampled. Two observers independently recorded radiographic and ultrasonographic findings without knowledge of arthroscopic findings. Imaging findings were compared between observers and with arthroscopic findings. Agreement between observers was moderate to excellent (κ 0.48-0.86) for detecting lesions using radiography and good to excellent (κ 0.74-0.87) for grading lesions using radiography. Agreement between observers was good to excellent (κ 0.78-0.94) for detecting lesions using ultrasonography and very good to excellent (κ 0.86-0.93) for grading lesions using ultrasonography. Diagnostic sensitivity was 84-88% for radiography and 100% for ultrasonography. Diagnostic specificity was 89-100% for radiography and 60-82% for ultrasonography. Agreement between radiography and arthroscopy was good (κ 0.64-0.78). Agreement between ultrasonography and arthroscopy was very good to excellent (κ 0.81-0.87). Findings from this study support ultrasound as a preferred method for predicting presence and severity of osteochondrosis lesions involving the femoral trochlear ridges in horses.

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Comparison of Computed Radiography and Conventional Radiography in Detection of Small Volume Pneumoperitoneum

Cited by 12 publications

References 15 publications

The left lateral projection is comparable to horizontal beam radiography for identifying experimental small volume pneumoperitoneum in the canine abdomen

The left lateral projection is comparable to horizontal beam radiography for identifying experimental small volume pneumoperitoneum in the canine abdomen

Repeatability and Intra‐ and Inter‐observer Agreement of Cervical Vertebral Sagittal Diameter Ratios in Horses with Neurological Disease

Diagnostic Sensitivity and Interobserver Agreement of Radiography and Ultrasonography for Detecting Trochlear Ridge Osteochondrosis Lesions in the Equine Stifle

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