Prospective Evaluation of Image Quality with Use of a Patient Image Gallery for Dose Reduction in Pediatric 16-MDCT

Honnef, Dagmar; Wildberger, Joachim E.; Haras, G.; Hohl, C.; Staatz, Gundula; Günther, Rolf W.; Mahnken, Andreas H.

doi:10.2214/ajr.07.3057

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Tube current is not only an important determinant of radiation dose but also image quality in X‐ray‐based examinations. As the radiation dose varies linearly with the tube current at a fixed peak kilovoltage and scanning time (Honnef et al 2008), thus 50% reduction in tube current reduces the radiation dose by half (Hamberg et al 2003; Kalra et al 2004). On the other hand, a decrease in tube current, when other parameters are kept constant, increases the quantum noise.…”

Section: Discussionmentioning

confidence: 99%

Effects of dose reduction on multi‐detector computed tomographic images in evaluating the maxilla and mandible for pre‐surgical implant planning: a cadaveric study

Koizumi

Sur

Seki

et al. 2010

Clinical Oral Implants Res

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Section: Discussionmentioning

confidence: 99%

Effects of dose reduction on multi‐detector computed tomographic images in evaluating the maxilla and mandible for pre‐surgical implant planning: a cadaveric study

Koizumi

Sur

Seki

et al. 2010

Clinical Oral Implants Res

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“…CT manufacturers started to provide paediatric color-coded protocols with weight or size-adapted tube current values in order to improve the CT scanner parameters adjustments. More recently computersimulated images for pre-examination overview of the expected image quality are also available (Frush et al 2002, Honnef et al 2008a, Honnef et al 2008b). The manufacturer recommended paediatric protocols are installed on the system and are arranged in colors according to height and weight for easy selection.…”

Section: Optimization and Unique Consideration In Paediatric Ctmentioning

confidence: 99%

Optimization of Image Quality in Paediatric Computed Tomography

Protik¹

2021

Preprint

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In this study the effects of ASIR™ and collimation on CT image quality (IQ) parameters were quantified. Catphan®600 phantom studies were performed on a GE HD750 64-slice scanner to investigate the impact of collimation 0.625mm vs. 5mm on the overall IQ. For noise and dose reduction ASIR™ was tested on 0.625mm collimation. The varying %ASIR™, scanned at 150mA and variable kVp and 50% ASIR™ compared to FBP on wide kVp/mA range was used. Image noise, CT# accuracy and uniformity, spatial and contrast resolution, MTF, CNR and Wiener spectrum analysis were performed on 0.625mmAX slices, 5mmAXMPR and 2mmCORMPR. Incremental advantages and disadvantages were seen with stepwise increase in %ASIR™. The 50% ASIR™ was found to be optimal blend for diagnostic quality and has potential for dose reduction in paediatric CT. This quantitative data could be used to design ASIR™-enhanced protocols with consideration of diagnostic task, balancing image quality and radiation dose.

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“…Pediatric imaging departments developed their own tables with tube current values adjusted to the patient's age, weight (Donnelly et al 2001) or diameter (Starck et al 2002). Manufacturers subsequently provided dedicated pediatric protocols with weight or size-adapted tube current values (Frush et al 2002), or more recently, computer-simulated images intended to provide a pre-examination overview of the expected image quality (Honnef et al 2008a(Honnef et al , 2008b. However, the rationale for such settings remains debatable, as they are still based on a subjective definition of image quality.…”

Section: Introductionmentioning

confidence: 99%

The relevance of image quality indices for dose optimization in abdominal multi-detector row CT in children: experimental assessment with pediatric phantoms

et al. 2009

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This study assessed and compared various image quality indices in order to manage the dose of pediatric abdominal MDCT protocols and to provide guidance on dose reduction. PMMA phantoms representing average body diameters at birth, 1 year, 5 years, 10 years and 15 years of age were scanned in a four-channel MDCT with a standard pediatric abdominal CT protocol. Image noise (SD, standard deviation of CT number), noise derivative (ND, derivative of the function of noise with respect to dose) and contrast-to-noise ratio (CNR) were measured. The 'relative' low-contrast detectability (rLCD) was introduced as a new quantity to adjust LCD to the various phantom diameters on the basis of the LCD(1%) assessed in a Catphan phantom and a constant central absorbed dose. The required variations of CTDIvol(16) with respect to phantom size were analyzed in order to maintain each image quality index constant. The use of a fixed SD or CNR level leads to major dose ratios between extreme patient sizes (factor 22.7 to 44 for SD, 31.7 to 51.5 for CNR(2.8%)), whereas fixed ND and rLCD result in acceptable dose ratios ranging between factors of 2.9 and 3.9 between extreme phantom diameters. For a 5-9 mm rLCD1(%), adjusted ND values range between -0.84 and -0.11 HU mGy(-1). Our data provide guidance on dose reduction on the basis of patient dimensions and the required rLCD (e.g., to get a constant 7 mm rLCD(1%) for abdominal diameters of 10, 13, 16, 20 and 25 cm, tube current-time product should be adjusted in order to obtain CTDIvol(16) values of 6.2, 7.2, 8.8, 11.6 and 17.7 mGy, respectively).

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Prospective Evaluation of Image Quality with Use of a Patient Image Gallery for Dose Reduction in Pediatric 16-MDCT

Abstract: A patient image gallery can be used as a basis for pediatric 16-MDCT examinations. The gallery provides a preexamination overview of expected image quality. Radiation exposure can be optimized with regard to patient weight and the image quality needed to answer the clinical question.

Cited by 5 publications

References 22 publications

Effects of dose reduction on multi‐detector computed tomographic images in evaluating the maxilla and mandible for pre‐surgical implant planning: a cadaveric study

Effects of dose reduction on multi‐detector computed tomographic images in evaluating the maxilla and mandible for pre‐surgical implant planning: a cadaveric study

Optimization of Image Quality in Paediatric Computed Tomography

The relevance of image quality indices for dose optimization in abdominal multi-detector row CT in children: experimental assessment with pediatric phantoms

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