title: Radiation dose and quickness of needle CT-interventions using a laser navigation system (LNS) compared with conventional method.
abstract: OBJECTIVE
  The aim of this study was to analyse the radiation dose and quickness of needle interventions using a Laser Navigation System (LNS-group) compared with conventional method (control-group).
  
  
  METHODS
  In this prospective, randomized, comparative study 58 patients (19 females, 39 males; mean age, 62.9 years) were punctured either with LNS (n=29) or with conventional method with a skin mark of the puncture site (n=29). In the LNS method the puncture site was marked with laser without additional CT. Thoracic and abdominal intervention was performed in 30 and 28 patients, respectively. Radiation dose and time of the procedures were analysed. Statistical significance was calculated according to the Mann-Whitney-U-test.
  
  
  RESULTS
  Mean target access path in the patients of the LNS group was 6.0 cm (range, 3.0-10.1cm) and in the control group 6.0 cm (range, 1.0-10.3 cm). Time duration of complete intervention in the LNS group was 20:25 min (range, 07:00-34:00 min) and in the control group 28:00 min (range, 13:00-51:00 min). The dose-length-product (DLP) of intervention scan of the LNS group was 42.3 mGy cm (range, 10-125 mGy cm), and of the control group 59.7 mGy cm (range, 25-176.42 mGy cm).
  
  
  CONCLUSIONS
  Using the LNS for CT-guided interventions results in faster intervention time with a lower dose.
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany. Electronic address: Ttgruberrouh@googlemail.com.
authors.forename: T
authors.initials: T
authors.lastname: Gruber-Rouh
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Schulz
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Eichler
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany; Department of Radiology, Faculty of Medicine, Alexandria University, Alexandria, Egypt.
authors.forename: Nagy N N
authors.initials: NN
authors.lastname: Naguib
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.
authors.forename: T J
authors.initials: TJ
authors.lastname: Vogl
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Zangos
mesh_terms: D000005:Abdomen / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004322:Drainage / Q000379:methods; D005260:Female; D006801:Humans; D061705:Image-Guided Biopsy / Q000379:methods; D007834:Lasers; D008297:Male; D008875:Middle Aged; D009339:Needles; D011446:Prospective Studies; D011677:Punctures / Q000295:instrumentation / Q000379:methods*; D011829:Radiation Dosage; D015641:Radiography, Interventional / Q000379:methods*; D011897:Random Allocation; D018709:Statistics, Nonparametric; D013909:Thorax / Q000473:pathology; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: CT-guided interventions; Laser navigation system; Quickness of intervention; Radiation dose