Repeated Head CT in the Neurosurgical Intensive Care Unit: Feasibility of Sinogram-Affirmed Iterative Reconstruction–Based Ultra-Low-Dose CT for Surveillance

Corcuera‐Solano, Idoia; Doshi, Amish; Noor, Abdisalan M.; Tanenbaum, Lawrence N.

doi:10.3174/ajnr.a3861

Cited by 12 publications

(10 citation statements)

References 25 publications

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“…These include iterative reconstruction models such as adaptive statistical iterative reconstruction and model-based iterative reconstruction. [9][10][11][12][13][14][32][33][34][35][36][37][38][39][40] Although these imaging algorithms provide an additional method for dose reduction in CT-guided procedures, their availability is currently limited to newer CT scanners for routine diagnostic CT imaging. The greater availability of the iterative reconstruction software over time may allow for increased operator comfort when evaluating low-dose images during CT-guided procedures, potentially further reducing the radiation dose.…”

Section: Discussionmentioning

confidence: 99%

“…Pediatric patients and patients who receive multiple scans for acute disease follow-up, chronic conditions, and screening purposes often undergo CT with modified scanning protocols to reduce dose. [9][10][11][12][13][14] This type of protocol modification has also been used in CT-guided interventions to limit radiation dose when performing multiple scans during the procedure. 8,[15][16][17][18] Given the increased desire to reduce radiation dose to patients, we transitioned our protocols for CT-guided spine biopsies to use a lower dose.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Radiation Dose Reduction in CT-Guided Spine Biopsies Does Not Reduce Diagnostic Yield

Shpilberg

Delman

Tanenbaum

et al. 2014

AJNR Am J Neuroradiol

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Radiation Dose Reduction in CT-Guided Spine Biopsies Does Not Reduce Diagnostic Yield

Shpilberg

Delman

Tanenbaum

et al. 2014

AJNR Am J Neuroradiol

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“…This was performed by an unblinded veterinary radiology resident (T.D.). Mean and standard deviation (SD) values were used to calculate signal‐to‐noise ratio (SNR) and contrast‐to‐noise ratio (CNR) using the following equations, consistent with previous publications:

SNR = normalMean normalH {normalU}_{normalROI} / S {normalD}_{normalROI}

CNR = {((), mean H U_{LE} - mean H U_{normalMM false)} / ([], (S {D_{LE}}^{2} + S {D_{MM}}^{2})))}^{1 / 2}

…”

Section: Methodsmentioning

confidence: 99%

“…on two occasions 4 weeks apart. Each radiologist graded image quality in accordance with a four point grading system (visual grade analysis) adapted from previous publications in human medicine (Table ). Each radiologist recorded their scores in a predesigned spreadsheet (Microsoft ® Excel for Mac, version 16.26).…”

Section: Methodsmentioning

confidence: 99%

Standing CT of the equine head: Reducing radiation dose maintains image quality

Davies

Skelly

Puggioni

et al. 2019

Vet Radiology Ultrasound

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Multiple published studies involving computed tomographic (CT) examinations of the equine head utilise a wide range of mAs parameters for image acquisition. This prospective, experimental study assessed the effects of lowering mAs during CT image acquisition on image quality and scatter radiation on 10 cadaver equine heads. Each head was scanned three times at 300, 225, and 150 mAs, with all other scanning parameters remaining constant between series. An anthropomorphic phantom was positioned adjacent to each equine head during image acquisition, mimicking a human bystander, with an ionization chamber attached to the phantom at eye level. Each series was reconstructed using filtered back projection, using medium (H30) and high (H80) frequency reconstruction algorithms. Quantitative image quality assessment was performed by calculating signal to noise ratio (SNR) and contrast to noise ratio (CNR). Two qualitative image quality assessments were performed independently by three blinded board certified veterinary radiologists with a 4 week interval, using a visual grade analysis model adapted from peer reviewed medical literature. Ionization chamber measurements, calculated volume CT dose index (CTDIvol), and dose‐length product (DLP) were recorded. Halving radiation dose during image acquisition from 300 to 150mAs resulted in comparable image quality between series. There was a statistically significant and linear relationship between mAs and scatter radiation to the bystander; halving mAs during image acquisition resulted in halving of scatter radiation. Results of this cadaveric study support the use of lower mAs settings during standing CT examinations of the equine head.

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“…Lower kVp values also lead to higher conspicuity of contrast media, especially when used with HCCM (19)(20)(21). Noise can be reduced by utilizing iterative reconstruction (IR) post processing techniques (22).…”

Section: Cta Techniquementioning

confidence: 99%

Preoperative cross-sectional mapping for deep inferior epigastric and profunda artery perforator flaps

Thimmappa¹,

Bhat²,

Bishop³

et al. 2019

Cardiovasc. Diagn. Ther.

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Perforator flap-based breast reconstruction in a post mastectomy patient requires dissection of the artery-vein bundle (perforators) responsible for perfusion of the subcutaneous fat and skin of the flap. Traditionally, these reconstructions were performed with the transverse rectus abdominis myocutaneous (TRAM) flap, but autologous breast reconstruction using muscle sparing free flaps has become steadily more popular in recent years. Preoperative imaging to locate and evaluate candidate perforators has become an essential step before patients undergo the microsurgical procedure. Preoperative mapping assists with operative planning, reduces operating times, and brings anatomical variations to their attention. Pre-operative imaging also assists in choosing the appropriate donor site for harvesting flaps. Computed tomography angiography (CTA) and magnetic resonance angiography (MRA) have been widely used for this type of preoperative imaging. Both MRA and CTA have their inherent advantages and disadvantages, and the preferred modality for this purpose varies by institution based on factors such as scanner availability, radiologist and surgeon experience, and comfort in interpreting the images. Concerns over excessive exposure to ionizing radiation and poor iodinated contrast agent enhancement of the intramuscular perforator course has made MRA the first-choice imaging modality in many centers. The purpose of the article is to review technique and protocols for the pre-operative CTA/MRA in patients who are being considered for a deep inferior epigastric artery perforator (DIEP) or profunda artery perforator (PAP) flap and to familiarize the reader with the normal and variant anatomic features of the deep inferior epigastric and PAP vessels along with the anatomic and surgical considerations used in the selection of perforator flap donor site for breast reconstruction post mastectomy.

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Repeated Head CT in the Neurosurgical Intensive Care Unit: Feasibility of Sinogram-Affirmed Iterative Reconstruction–Based Ultra-Low-Dose CT for Surveillance

Cited by 12 publications

References 25 publications

Radiation Dose Reduction in CT-Guided Spine Biopsies Does Not Reduce Diagnostic Yield

Radiation Dose Reduction in CT-Guided Spine Biopsies Does Not Reduce Diagnostic Yield

Standing CT of the equine head: Reducing radiation dose maintains image quality

Preoperative cross-sectional mapping for deep inferior epigastric and profunda artery perforator flaps

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