Optimization of parameters for the detection of cerebral aneurysms: CT angiography of a model

David F. Kallmes, Avery J. Evans, Richard J. Woodcock, Reed A. Omary, James E. Dix, Barry C. McNulty, Chad A. Holder, Jacques E. Dion

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


PURPOSE: To optimize parameters with computed tomographic angiography for the detection of cerebral aneurysms. MATERIALS AND METHODS: Model aneurysms were placed randomly at various branch points and scanned multiple times with spiral technique. The final analysis included 63 branch points and 22 aneurysms. Each spiral scan used a different parameter combination. Collimation ranged from 1.5 to 4.0 mm and pitch ranged from 1:1 to 1.5:1. Images were constructed with shaded surface display (SSD) and maximum intensity projection (MIP) algorithms and were interpreted by three readers for the presence or absence of aneurysm. RESULTS: The receiver operating characteristic (ROC) curve area for 1.5-mm collimation was greater than those of 3- or 4-mm collimation (P < .01 and P < .001, respectively). There was no statistically significant difference in the ROC curve areas between 3- and 4- mm collimation (P = .37). There was no statistically significant decrease in ROC curve area when increasing pitch from 1:1 to 1.5:1 for any value of collimation (P = .96). For all parameter combinations the ROC curve areas for SSD images was greater than that of MIP images (P < .0001). CONCLUSION: For cerebral aneurysm detection, narrow collimation is superior to wider collimation. Mild increases in pitch do not substantially degrade diagnostic accuracy. SSD offers improved diagnostic accuracy over MIP display in this model.

Original languageEnglish (US)
Pages (from-to)403-405
Number of pages3
Issue number2
StatePublished - Aug 1996


  • Aneurysm, MR
  • Aneurysm, cerebral
  • MR, technology

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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