Low-dose, Prospective Triggered High-pitch Spiral Coronary Computed Tomography Angiography

Srichai, Monvadi B.; Lim, Ruth; Donnino, Robert; Mannelli, Lorenzo; Hiralal, Rajesh; Avery, Ryan; Ho, Corey K.; Babb, James S.; Jacobs, Jill E.

doi:10.1016/j.acra.2012.01.009

Cited by 24 publications

(15 citation statements)

References 32 publications

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“…These artifacts made it difficult to use CTCA to accurately assess the degree of luminal narrowing when heavily calcified plaques were present (30) . Although Srichai et al (31) reported that HPS mode had image quality no worse than that of LPS mode and there was no significant difference in the inter‐reader variability in diagnosis between the HPS and LPS modes, they excluded patients who had a history of coronary artery bypass surgery or metallic prosthetic valve replacement surgery from the study population. If these patients were to be included in a study population, there could be some deterioration in the quality of clinical images, which has some influence on clinical interpretation because these patients have heavily calcified plaques or metallic valves that cause beam‐hardening artifacts and lead to misdiagnosis.…”

Section: Discussionmentioning

confidence: 99%

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

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One‐hundred‐and‐twenty‐eight–section dual X‐ray source computed tomography (CT) systems have been introduced into clinical practice and have been shown to increase temporal resolution. Higher temporal resolution allows low‐dose spiral mode at a high pitch factor during CT coronary angiography. We evaluated radiation dose and physical image qualities in CT coronary angiography by applying high‐pitch spiral, step‐and‐shoot, and low‐pitch spiral modes to determine the optimal acquisition mode for clinical situations. An anthropomorphic phantom, small dosimeters, a calibration phantom, and a microdisc phantom were used to evaluate the radiation doses absorbed by thoracic organs, noise power spectrums, in‐plane and z‐axis modulation transfer functions, slice sensitivity profiles, and number of artifacts for the three acquisition modes. The high‐pitch spiral mode had the advantage of a small absorbed radiation dose, but provided low image quality. The low‐pitch spiral mode resulted in a high absorbed radiation dose of approximately 200 mGy for the heart. Although the absorbed radiation dose was lower in the step‐and‐shoot mode than in the low‐pitch spiral mode, the noise power spectrum was inferior. The quality of the in‐plane modulation transfer function differed, depending on spatial frequency. Therefore, the step‐and‐shoot mode should be applied initially because of its low absorbed radiation dose and superior image quality.PACS numbers: 87.57.‐s; 87.57.C‐; 87.57.cf; 87.57.cm; 87.57.cp; 87.57.Q‐; 87.57.qp; 87.57.uq

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Section: Discussionmentioning

confidence: 99%

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

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show abstract

“…Srichai et al [19] reported that HPS acquisition had image quality no worse than that of LPS acquisition, and there was no significant difference in the inter-reader variability in diagnosis between the HPS and LPS acquisitions. However, they excluded patients who had a history of coronary artery bypass surgery or metallic prosthetic valve replacement surgery from the study population.…”

Section: Discussionmentioning

confidence: 99%

Radiation doses, noise properties, and in-plane spatial resolutions for CT coronary angiography using different CT scanners: Phantom study

Matsubara

Takata

Mori

et al. 2015

IJDI

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Objective: We aimed to evaluate radiation doses, noise properties, and in-plane spatial resolutions for CT coronary angiography (CTCA) using different CT scanners and phantoms.Methods: ECG-gated step-and-shoot (SAS) and low-pitch spiral (LPS) acquisitions were performed using the 64-section single-source CT (SSCT) system. ECG-gated high-pitch spiral (HPS), SAS, and LPS acquisitions were performed using the 128-section dual-source CT (DSCT) system. The absorbed doses for thoracic organs were measured using an anthropomorphic phantom and radiophotoluminescent glass dosimeters. Noise properties and in-plane spatial resolutions were evaluated using a calibration phantom and a cylinder phantom constructed in-house, respectively. Results:The absorbed doses for thoracic organs differed significantly depending on the acquisition modes and not the scanners. The doses absorbed by the heart were 66.8 and 215.5 mGy with SAS and LPS acquisitions using the 64-section SSCT system, respectively, and 10.0, 96.1, and 195.7 mGy with HPS, SAS, and LPS acquisitions using the 128-section DSCT system, respectively. Noise properties and in-plane spatial resolutions differed significantly depending on the scanners used but not the acquisition modes. Conclusions:To optimize the patient dose, an appropriate acquisition mode should be chosen according to the scanner type, patient's average heart rate, stability of a patient's heartbeat, and patient's history.

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“…While radiologist are usually familiar with the more common imaging including radiographs, computed tomography (CT), magnetic resonance imaging (MRI) and ultrasound (US) procedures, many are not aware of the significant contributions nuclear medicine can make in the management of patients in acute care [1][2][3][4][5][6][7]. While other radiologic imaging methods depict anatomy and rely on knowledge of normal patterns to recognize abnormal ones, nuclear medicine evaluates organ and physiologic functions.…”

Section: Introductionmentioning

confidence: 98%

Nuclear medicine and the emergency department patient: an illustrative case-based approach

et al. 2014

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Radiologists are familiar with the use of radiographs, computed tomography, magnetic resonance imaging and ultrasound in the acute clinical setting. However, there are some specific clinical scenarios which may be found in nuclear medicine imaging problem-solving tools. These clinical scenarios and imaging techniques are less frequent, and the referring clinician from the emergency department may not consider these alternatives. It is important for the radiologist to be aware of these techniques to be able to guide the clinician to use those tools, which may result in optimal patient care. In this article, we will discuss those nuclear medicine studies which have application in the setting of an emergency radiology practice.

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Low-dose, Prospective Triggered High-pitch Spiral Coronary Computed Tomography Angiography

Cited by 24 publications

References 32 publications

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Radiation doses, noise properties, and in-plane spatial resolutions for CT coronary angiography using different CT scanners: Phantom study

Nuclear medicine and the emergency department patient: an illustrative case-based approach

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