High speed bolus tagging: time resolved velocity quantification of pulsatile flow in a single breath hold

Using cardiac magnetic resonance, we tested whether a single-breath-hold approach to cardiac functional evaluation was equivalent to the established multiple-breath-hold method. We examined 39 healthy volunteers (mean age, 31.9 ± 11.4 yr; 22 men) by using 1.5 T with multiple breath-holds and our proposed single breath-hold. Left ventricular and right ventricular ejection fractions (LVEF and RVEF), LV and RV end-diastolic volumes (LVEDV and RVEDV), and LV myocardial mass (LVMM) were compared by using Bland-Altman plots; LVEF and RVEF were tested for equivalence by inclusion of 95% confidence intervals (CIs). Equivalence of the methods was assumed within the range of −5% to 5%. In the multiple- versus the single-breath-hold method, LVEF was 0.62 ± 0.05 versus 0.62 ± 0.04, and RVEF was 0.59 ± 0.06 versus 0.59 ± 0.07. The mean difference in both methods was −0.2% (95% CI, −1 to 0.6) for LVEF and 0.3% (95% CI, −0.8 to 1.5) for RVEF. The mean differences between methods fit within the predetermined range of equivalence, including the 95% CI. The mean relative differences between the methods were 3.8% for LVEDV, 4.5% for RVEDV, and 1.6% for LVMM. Results of our single-breath-hold method to evaluate LVEF and RVEF were equivalent to those of the multiple-breath-hold technique. In addition, LVEDV, RVEDV, and LVMM showed low bias between methods.

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Time-resolved early-to-late Gadolinium enhancement MRI using single breath-hold 3D spiral imaging

Journal of Cardiovascular Magnetic Resonance ◽

10.1186/1532-429x-14-s1-p250 ◽

2012 ◽

Vol 14 (S1) ◽

Author(s):

Taehoon Shin ◽

Dwight G Nishimura ◽

Michael V McConnell ◽

Bob S Hu

Keyword(s):

Late Gadolinium Enhancement ◽

Breath Hold ◽

Gadolinium Enhancement ◽

Time Resolved ◽

Spiral Imaging ◽

Single Breath ◽

Single Breath Hold

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Interpretation of CT Scan Findings During the COVID-19 Pandemic

hormozgan medical journal ◽

10.5812/hmj.107909 ◽

2020 ◽

Vol 24 (4) ◽

Author(s):

Ebrahim Nouri ◽

Omolbanin Delashoub ◽

Mohammad Ali Shahabi-Rabori ◽

Reza Afzalipour ◽

Salman Jafari

Keyword(s):

Ct Scan ◽

High Speed ◽

Ground Glass Opacity ◽

First Trimester ◽

Breath Hold ◽

Respiratory Problems ◽

Single Breath ◽

Single Breath Hold ◽

First Trimester Of Pregnancy ◽

Almost All

: Studies have documented criteria for the prevention, diagnosis, and treatment of COVID-19 pneumonia as more information has become available about its symptoms and complications. Similar to other coronavirus-induced cases of pneumonia, COVID-19 pneumonia causes acute respiratory problems. The chest CT scan, which is easily available in almost all areas, is a common imaging technique for diagnosing pneumonia. Its findings, which are accompanied by high speed, quality, and accuracy, allow the radiologist to easily identify affected areas of the lungs and to determine typical radiological features of patients with pneumonia caused by COVID-19. These features include ground-glass opacity, multifocal patchy consolidation, and interstitial changes with the peripheral distribution. The highest incidence occurs in the 4th and 5th lobes, where about 50% to 75% of the lesions observed. For infected patients, the CT scan protocol includes administration of HRCT technique in the inspiration phase with spiral 4-slice devices and higher. Scan parameters also include KV: 100 - 120, and mAs: 20 - 30, thickness = 1 - 2 mm, spiral, single breath-hold, and Pitch = 0.8 - 1.5, which are determined for all patients. Since there are restrictions on using ionizing radiation for pregnant women, it is recommended to initially conduct PCR tests. If necessary, typical radiography with an abdominal shield can be used for women in the first trimester of pregnancy, and the HRCT technique in low doses can be used for those in the second and third trimesters.

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