Enum DecomposeChiBound 

pub enum DecomposeChiBound {
    Ppm(f64),
    EchoSpacing,
}

The bound on |χ| in DECOMPOSE’s stage-3 search ([0, −bound] to [bound, 0]), see the module docs, The χ bound.

Variants

Ppm(f64)

A fixed bound in ppm. The authors’ is 0.5 (Chen et al. 2021, §2.2), the default.

EchoSpacing

π / ((2/3)·γ·B0·ΔTE_max), the largest |χ| whose phase step between echoes stays under π, so that unwrapping along the echoes is unambiguous; ΔTE_max is the largest of TE₁ and the echo spacings. A tuning value: 0.3145 ppm at 7 T with 8 ms spacing.

Implementations

impl DecomposeChiBound

pub fn id(self) -> &'static str

Stable id: "ppm" (whatever its value) or "echo-spacing".

pub fn resolve(self, b0: f64, echo_times: &[f64]) -> Result<f64, InputError>

The bound in ppm at field b0 (T) and echo_times (s, in acquisition order). Errors if it is not ≥ 0 (a negative bound leaves the fit’s lower bound above its upper one), or for EchoSpacing not a finite positive bound (no echoes, a time ≤ 0).

Trait Implementations

impl Clone for DecomposeChiBound

fn clone(&self) -> DecomposeChiBound

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DecomposeChiBound

impl Debug for DecomposeChiBound

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DecomposeChiBound

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for DecomposeChiBound

fn eq(&self, other: &DecomposeChiBound) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for DecomposeChiBound

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DecomposeChiBound