Håkan Geijer

Summary

Affiliation: Orebro University Hospital
Country: Sweden

Publications

  1. ncbi request reprint Radiation dose and image quality in diagnostic radiology. Optimization of the dose-image quality relationship with clinical experience from scoliosis radiography, coronary intervention and a flat-panel digital detector
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85, Orebro
    Acta Radiol Suppl 43:1-43. 2002
  2. pmc Comparison of color LCD and medical-grade monochrome LCD displays in diagnostic radiology
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85, Orebro, Sweden
    J Digit Imaging 20:114-21. 2007
  3. ncbi request reprint Image quality vs. radiation dose for a flat-panel amorphous silicon detector: a phantom study
    H Geijer
    Department of Radiology, Orebro Medical Centre Hospital, 701 85 Orebro, Sweden
    Eur Radiol 11:1704-9. 2001
  4. ncbi request reprint Varied tube potential with constant effective dose at lumbar spine radiography using a flat-panel digital detector
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85 Orebro, Sweden
    Radiat Prot Dosimetry 114:240-5. 2005
  5. doi request reprint Optimizing the tube potential for lumbar spine radiography with a flat-panel digital detector
    H Geijer
    Department of Radiology, Orebro University Hospital, Orebro, Sweden
    Br J Radiol 82:62-8. 2009
  6. ncbi request reprint Radiation dose optimization in coronary angiography and percutaneous coronary intervention (PCI). I. Experimental studies
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 12:2571-81. 2002
  7. ncbi request reprint Radiation dose optimization in coronary angiography and percutaneous coronary intervention (PCI). II. Clinical evaluation
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 12:2813-9. 2002
  8. ncbi request reprint Digital radiography of scoliosis with a scanning method: radiation dose optimization
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 13:543-51. 2003
  9. ncbi request reprint Radiation exposure and patient experience during percutaneous coronary intervention using radial and femoral artery access
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 14:1674-80. 2004
  10. doi request reprint Slower progression of atherosclerosis in vein grafts harvested with 'no touch' technique compared with conventional harvesting technique in coronary artery bypass grafting: an angiographic and intravascular ultrasound study
    Benny L Johansson
    Department of Cardiology, Orebro University Hospital, Orebro, Sweden
    Eur J Cardiothorac Surg 38:414-9. 2010

Collaborators

Detail Information

Publications25

  1. ncbi request reprint Radiation dose and image quality in diagnostic radiology. Optimization of the dose-image quality relationship with clinical experience from scoliosis radiography, coronary intervention and a flat-panel digital detector
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85, Orebro
    Acta Radiol Suppl 43:1-43. 2002
    ..IN SUMMARY: This thesis indicates the possibility of dose reduction in diagnostic radiology through optimization of the radiographic process...
  2. pmc Comparison of color LCD and medical-grade monochrome LCD displays in diagnostic radiology
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85, Orebro, Sweden
    J Digit Imaging 20:114-21. 2007
    ..The VGA scores were -0.28 for the color and -0.25 for the monochrome display (p = 0.24; NS). It thus seems possible to use color displays in diagnostic radiology provided that grayscale adjustment is used...
  3. ncbi request reprint Image quality vs. radiation dose for a flat-panel amorphous silicon detector: a phantom study
    H Geijer
    Department of Radiology, Orebro Medical Centre Hospital, 701 85 Orebro, Sweden
    Eur Radiol 11:1704-9. 2001
    ..The flat-panel detector has a very favourable combination of image quality vs radiation dose compared with storage phosphor plates and screen film...
  4. ncbi request reprint Varied tube potential with constant effective dose at lumbar spine radiography using a flat-panel digital detector
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, SE 701 85 Orebro, Sweden
    Radiat Prot Dosimetry 114:240-5. 2005
    ..However, this cannot be done with automatic exposure, which is set for a constant detector dose...
  5. doi request reprint Optimizing the tube potential for lumbar spine radiography with a flat-panel digital detector
    H Geijer
    Department of Radiology, Orebro University Hospital, Orebro, Sweden
    Br J Radiol 82:62-8. 2009
    ..This leads to a lower effective dose and/or increased image quality depending on the settings chosen. The factorial experiments provided a powerful way to evaluate several parameters concomitantly...
  6. ncbi request reprint Radiation dose optimization in coronary angiography and percutaneous coronary intervention (PCI). I. Experimental studies
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 12:2571-81. 2002
    ..Radiation dose to patient and operator in PCI is heavily dependent on both equipment set-up and operating parameters which can be influenced by the operator. With a careful optimization, a large reduction of radiation dose is possible...
  7. ncbi request reprint Radiation dose optimization in coronary angiography and percutaneous coronary intervention (PCI). II. Clinical evaluation
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 12:2813-9. 2002
    ..The KAP for digital acquisition did not change significantly. It is possible to make a large dose reduction in PCI by reducing the fluoroscopy dose rate. This dose reduction is beneficial for both patients and staff...
  8. ncbi request reprint Digital radiography of scoliosis with a scanning method: radiation dose optimization
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 13:543-51. 2003
    ..The optimization resulted in a dose reduction to 31% of the original effective dose with an acceptable reduction in image quality considering the intended use of the images for angle measurements...
  9. ncbi request reprint Radiation exposure and patient experience during percutaneous coronary intervention using radial and femoral artery access
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 14:1674-80. 2004
    ..001). DAP does not increase when using radial instead of femoral access and the patients grade discomfort and pain much lower when using radial access. Radial access is thus beneficial to use...
  10. doi request reprint Slower progression of atherosclerosis in vein grafts harvested with 'no touch' technique compared with conventional harvesting technique in coronary artery bypass grafting: an angiographic and intravascular ultrasound study
    Benny L Johansson
    Department of Cardiology, Orebro University Hospital, Orebro, Sweden
    Eur J Cardiothorac Surg 38:414-9. 2010
    ..This cineangiographic and intravascular ultrasound (IVUS) substudy examined possible mechanisms...
  11. doi request reprint Urinary stone size estimation: a new segmentation algorithm-based CT method
    Mats Lidén
    School of Health and Medical Sciences, Orebro University, S 701 82, Orebro, Sweden
    Eur Radiol 22:731-7. 2012
    ..The objective of the present study was to develop a reader independent urinary calculus segmentation algorithm using well-known digital image processing steps and to validate the method against size estimations by several readers...
  12. doi request reprint Virtual non-contrast dual-energy CT compared to single-energy CT of the urinary tract: a prospective study
    Margareta Lundin
    Department of Radiology, Orebro University Hospital, Orebro University, Orebro, Sweden
    Acta Radiol 53:689-94. 2012
    ..With the recent introduction of a second generation of DECT, there is a possibility of obtaining VNC images with better image quality at hopefully lower radiation dose compared to the previous generation...
  13. ncbi request reprint Coaxial technique for catheterization of the coronary arteries with a very dilated ascending aorta
    Håkan Geijer
    Department of Radiology, Orebro University Hospital, Orebro, Sweden
    Catheter Cardiovasc Interv 62:32-4. 2004
    ..Two catheters are used in a coaxial fashion. It was possible to catheterize a patient with a 9 cm wide ascending aorta...
  14. ncbi request reprint Optimization of image process parameters through factorial experiments using a flat panel detector
    Eva Norrman
    Department of Natural Sciences, Orebro University, SE 701 82 Orebro, Sweden
    Phys Med Biol 52:5263-76. 2007
    ..Performing a factorial experiment gave an overview of how the image quality was influenced by image processing. By adjusting the level of noise compensation, unsharp masking and kernel, the IQF was improved to a 30% lower effective dose...
  15. ncbi request reprint Bowel preparation for excretory urography is not necessary: a randomized trial
    M Jansson
    Department of Radiology, Orebro University Hospital, SE 701 85 Orebro, Sweden
    Br J Radiol 80:617-24. 2007
    ..The results of our study show equality of the evaluated preparation methods and cannot justify further use of bowel purgation before excretory urography...
  16. ncbi request reprint Digital radiography of scoliosis with a scanning method: initial evaluation
    H Geijer
    Departments of Radiology, Orebro Medical Centre Hospital, 701 85 Orebro, Sweden
    Radiology 218:402-10. 2001
    ..To evaluate the radiation dose, image quality, and Cobb angle measurements obtained with a digital scanning method of scoliosis radiography...
  17. ncbi request reprint Dose-image optimisation in digital radiology with a direct digital detector: an example applied to pelvic examinations
    Jan Persliden
    Department of Medical Physics, Orebro University Hospital, 701 85 Orebro, Sweden
    Eur Radiol 12:1584-8. 2002
    ..A substantial dose reduction was obtained with this new direct digital detector. This simple but efficient optimisation approach is easily applicable to other examinations and both DDD and storage phosphor plate detectors...
  18. ncbi request reprint Impact of digital imaging on radiation doses to the patient during X-ray examination of the urinary tract
    B Sjöholm
    Department of Medical Physics, Orebro University Hospital, Orebro, Sweden
    Acta Radiol 46:657-61. 2005
    ..To compare radiation doses given to patients undergoing IVU (intravenous urography) before and after digitalization of our X-ray department...
  19. ncbi request reprint Experiences of intentional carotid stenting in endovascular repair of aortic arch aneurysms--two case reports
    T Larzon
    Department of Surgery, Orebro University Hospital, Orebro, Sweden
    Eur J Vasc Endovasc Surg 30:147-51. 2005
    ....
  20. ncbi request reprint Reducing dose in urography while maintaining image quality-a comparison of storage phosphor plates and a flat-panel detector
    Margareta Jansson
    Department of Radiology, Orebro University Hospital, 701 85, Orebro, Sweden
    Eur Radiol 16:221-6. 2006
    ..Equivalent image quality in image pairs was achieved at 30% of the dose. The CDRAD contrast-detail phantom makes it possible to find dose levels that give equal image quality using different imaging systems...
  21. ncbi request reprint Fascia suturing of large access sites after endovascular treatment of aortic aneurysms and dissections
    Thomas Larzon
    Department of Surgery, Orebro University Hospital, Orebro, Sweden
    J Endovasc Ther 13:152-7. 2006
    ..To evaluate a technique for closure of a femoral artery access in which the cribriform fascia covering the common femoral artery is sutured...
  22. ncbi request reprint Harvesting the saphenous vein with surrounding tissue for CABG provides long-term graft patency comparable to the left internal thoracic artery: results of a randomized longitudinal trial
    Domingos S R Souza
    Department of Cardiothoracic Surgery and Anesthesiology, Orebro University Hospital, SE 701 85 Orebro, Sweden
    J Thorac Cardiovasc Surg 132:373-8. 2006
    ..Conventional harvesting of the saphenous vein in coronary artery bypass surgery produces vessel damage that contributes to graft failure. A novel "no touch" technique provides high short- and long-term patency rates...
  23. ncbi request reprint Radiation exposure in stent-grafting of abdominal aortic aneurysms
    H Geijer
    Department of Radiology, Orebro University Hospital, Sweden
    Br J Radiol 78:906-12. 2005
    ..If the same patients had been treated using dedicated angiographic equipment, the risk of skin injury would be much higher. It is thus important to be aware of the dose output of the equipment that is used...
  24. ncbi request reprint Assessment of left ventricular function from M-mode measurement of circumflex artery motion recorded by coronary angiography
    Anders Kähäri
    Department of Radiology, Orebro University Hospital, Orebro, Sweden
    Scand Cardiovasc J 37:259-65. 2003
    ..To evaluate the usefulness of M-mode measurement of circumflex artery motion (CAM) for assessment of left ventricular (LV) function...
  25. doi request reprint Making renal stones change size-impact of CT image post processing and reader variability
    Mats Lidén
    School of Health and Medical Sciences, Orebro University, 701 82, Orebro, Sweden
    Eur Radiol 21:2218-25. 2011
    ..The objectives of this study were to quantify the impact of image post-processing parameters on the apparent renal stone size, and to quantify the intra- and inter-reader variability in renal stone size estimation...